Respostas
Resposta:
Explicação passo a passo:
Resposta:
A)x=10
B)x=-4
C)x=-7
D)x=5
E)x=-5
F)x=3
G)x=5
H x=-3
Explicação passo-a-passo:
A)2×+4(x+15)=120
2×+4(x+15)=120
4(x+15)
4x+4×15
4x+60
2x+4(x+15)=120
2x+4x+60=120
2x+4x
(2+4)x
6x
2x+4x+20=120
6x+60=120
6x+60-60=120-60
6x=120-60
6x=60
6x=6=60÷6
x=60÷6
6x÷6=60÷6
x=10
Resposta
x=10
B)5x+12=-8
5x+12=-8
5x+12-12=-8-12
5x=8-12
-8-12
-(8+12)
-20
5x=-8-12
5x=-20
5x÷5=5-20÷5
x=-20÷5
5x÷5=-20÷5
x=-4
5x=-20
x=-4
Resposta
x=-4
C) 3(x+8)=3
3(x+8)=3
3(x+8)÷3=3÷3
x+8=3÷3
3(x+8)÷3=3÷3
x+8=1
3(x+8)=3
x+8=1
x+8-8=1-8
x=1-8
x+8=1
x=1-8
-(8-1)
-7
x=1-8
x=-7
Resposta
x=-7
D)6x-40=-10
6x-40=-10
6x-40+40=-10+40
6x=-10+40
6x-40=-10
6x=-10+40
-10+40
+(40-10)
30
6x=-10+40
6x=30
6x÷6=30÷6
x=30÷6
6x÷6=30÷6
x=5
6x=30
x=5
Resposta
x=5
E)10+4(-x+10)=70
19+4(-x+10)=70
4(-x+10)
-4x+4x10
-4x+40
10+4(-x+10)=70
10-4x+40=70
50-4x=70
50-4x-50=70-50
-4x=70-50
50-4x=70
-4x=70-50
-4x=20
-4x÷(-4)=20÷(-4)
x=20÷(-4)
-4x÷(-4)=20÷(-4)
x=-20÷4
-4x÷(-4)=20÷(-4)
x=-5
-4x=20
x=-5
Resposta
x=-5
F) 3x+2x-20=-5
3x+2x-20=-5
3x+2x
(3+2)x
5x
3x+2x-20=-5
5x-20=-5
5x-20+20=-5+20
5x=-5+20
5x-20=-5
5x=-5+20
-5+20
+(20-5)
15
5x=-5+20
5x=15
5x÷=15÷5
x=15÷5
5x÷15÷5
x=3
5x=15
x=3
Resposta
x=3
G)3(2x-9)+15=18
3(2x-9)+15=18
3(2x-9)
3×2x-3×9
6x-3×9
3×2x-3×9
6x-27
3(2x-9)+15=18
6x-27+15=18
-27+15
-(27-15)
-12
6x-27+15=18
6x-12=18
6x-12+12=18+12
6x=18+12
6x-12=18
6x=18+12
6x=30
6x÷6=30÷6
x=30÷6
6x÷6=30÷6
x=5
6x=30
x=5
Resposta
x=5
H) 12+4(3x+11)-20=2x+6
12+4(3x+11)-20=2x+6
4(3x11)
4×3x+4×11
12x+4×11
4×3x+4×11
12x+44
12+4(3x+11)-20=2x+6
12+12x+44-20=2x+6
12+44-20
56-20
36
12+12x+44-20=2x+6
36+12x=2x+6
36+12x-2x=2x+6-2x
36+12x-2x=6
36+12x=2x+6
36+12x-2x=6
36+12x-2x+6
36+12x-2x-36=6-36
12x-2x=6-36
36+12x=2x+6
12x-2x=6-36
12x-2x
(12-2)x
10x
12x-2x=6-36
10x=6-36
12x-2x=6-36
6-36
-(366)
-30
12x-2x=6-36
10x=-30
10x÷10=-30÷10
x=-30÷10
10x÷10=-30÷10
x=-3
10x=-30
x=-3
Resposta
x=-3