Question

por favor é uma revisão para a prova!!! 68 pontos

Answer 1

a) (x+2)+5=2x+12
x+7=2x+12
x-2x=12-7
-x=5
x=-5

b) x+4(x-1)=9-2(x+3)
x+4x-4=9-2x-6
x+4x+2x=9-6+4
7x=7
x=7/7
x=1

c) 3x+2=2x-11
3x-2x=-11-2
x=-13

d) 5(3x-2)=2(6x+3)
15x-10=12x+6
15x-12x=6+10
3x=16
x=16/3

e) 2(3x-1)=2x+5
6x-2=2x+5
6x-2x=5+2
4x=7
x=7/4

f)2x+14=5x-1
2x-5x=-1-14
-3x=-15
-x=-15/3
-x=-5
x=5

g)4x-5=6x+11
4x-6x=11+5
-2x=16
-x=16/2
-x=8
x=-8
h)5x+4-2x=26-3x
5x+3x-2x=26-4
6x=22
x=22/6

i)-10+4-2x=-4x-7
-2x+4x=-7+10-4
2x=-1
x=-1/2

j)10x-8-2=7x-4
10x-7x=-4+2+8
3x=6
x=6/3
x=2

espero ter ajudado

Answer 2

A ) ( x + 2 ) + 5 = 2x + 12
x + 7 = 2x + 12
x - 2x = 12 - 7
- x = 5 . ( - 1 )
x = - 5

B ) x + 4 ( x - 1 ) = 9 - 2 ( x + 3 )
x + 4x - 4 = 9 - 2x - 6
x + 4x + 2x = 9 - 6 + 4
7x = 7
x = 7/7
x = 1

C ) 3x + 2 = 2x - 11
3x - 2x = - 11 - 2
x = - 13

D ) 5 ( 3x - 2 ) = 2 ( 6x + 3 )
15x - 10 = 12x + 6
15x - 12x = 6 + 10
3x = 16
x = 16/3

E ) 2 ( 3x - 1 ) = 2x + 5
6x - 2 = 2x + 5
6x - 2x = 5 + 2
4x = 7
x = 7/4

F ) 2x + 14 = 5x - 1
2x - 5x = - 1 - 14
- 3x = - 15 . ( - 1 )
3x = 15
x = 15/3
x = 5

G ) 4x - 5 = 6x + 11
4x - 6x = 11 + 5
- 2x = 16 . ( - 1 )
2x = - 16
x = - 16/2
x = - 8

H ) 5x + 4 - 2x = 26 - 3x
5x - 2x + 3x = 26 - 4
6x = 22
x = 22/6

I ) - 10 + 4 - 2x = - 4x - 7
- 2x + 4x = - 7 + 10 - 4
2x = - 1
x = - 1/2

J ) 10x - 8 - 2 = 7x - 4
10x - 7x = - 4 + 8 + 2
3x = 6
x = 6/3
x = 2