Question

Calcular:
5(x+2)=35

-2(x-1)=20

-4(x-2)=30

9x+5=4x+7

Answer 1

5(x+2)=35
5x + 10 = 35
5x =  35-10
x = 25/5
x = 5 

-2(x-1)=20
-2x + 2 = 20
-2x = 20-2
-2x = 18 [-1]
2x = -18
x = -18/2
x = -9

-4(x-2)=30
-4x +8 = 30
-4x = 30 -8
-4x = 22 [-1]
4x = -22
x = -22/4

9x+5=4x+7
9x - 4x = 7-5
5x = 2
x = 2/5

Answer 2

5(x+2)=35
5x+10=35
5x=35-10
5x=25
x=25/5
x=5

-2(x-1)=20
-2x+2=20
-2x=18
-x=18/2
x=9

-4(x-2)=30
-4x+8=30
-4x=22
-x=22/4
x=5,5

9x+5=4x+7
9x-4x=7-5
5x=2
x=2/5
x=0,4

Boa noite!