Respostas
Resposta:
m) x = 4
n)x = 3
o)x = 25/2
p)x = 29/2
q)x = -3/5
r)x = 5
s)x = 24
t)2 = x
u)x = 3/2
v)x = 6
w) x = -1
x)-22 = x
y)x = 7/2
z)x = 8
Explicação:
m) 5x-3 = 2x+9
5x-2x = 9+3
3x = 12
x = 12÷3
x = 4
n)3×(x+2) = 15
3x+6 = 15
3x= 15-6
3x = 9
x = 9÷3
x = 3
o)2×(x-1)-7 = 16
2x-2-7 = 16
2x = 16+2+7
2x= 18+7
2x = 25
x = 25/2
p)7×(x-2) = 5×(x+3)
7x-14 = 5x+15
7x-5x = 15+14
2x = 29
x = 29/2
q)2×(x-6) = -3×(5+x)
2x-12 = -15-3x
2x+3x = -15+12
5x = -3
x = -3/5
r)3×(2x-3)+2×(x+1) = 3x+18
6x-9+2x+2 = 3x+18
6x+2x-3x = 18+9-2
8x-3x = 27-2
5x = 25
x = 25÷5
x = 5
s)2x+3×(x-5) = 4x+9
2x+3x-15 = 4x+9
2x+3x-4x = 9+15
5x-4x = 9+15
x = 24
t)2×(x+1)-3×(2x-5) = 6x-3
2x+2-6x+15 = 6x-3
2+15+3 = 6x+6x-2x
17+3 = 12x-2x
20 = 10x
20÷10 = x
2 = x
u)3x-5 = x-2
3x-x = -2+5
2x = 3
x = 3/2
v)3x-5 = 13
3x = 13+5
3x = 18
x = 18÷3
x = 6
w) 3x+5 = 2
3x = 2-5
3x = -3
x = -3÷3
x = -1
x)x-(2x-1) = 23
x-2x+1 = 23
1-23 = -x+2x
-22 = x
y)2x-(x-1) = 5-(x-3)
2x-x+1 = 5-x+3
2x-x+x = 5+3-1
2x = 7
x = 7/2
z)x/2+x/4 = 6
(4÷2×x)+(4÷4×x)/4 = (4÷1×6)/4
(2×x)+(1×x)/4 = (4×6)/4
2x+x/4 = 24/4
3x/4 = 24/4
3x = 24
x = 24÷3
x = 8