Question

valendo 40 pontos ⬇⬇

A - 3x =2x + 100 + 50

B - 9x - 3 ( 2x + 2 ) = 15

C - x + 2 ( x + 3 ) = 45

D - 4x + 13 = 2x + 17

Answer 1

3x =2x + 100 + 50
3x-2x=150
x=150

9x - 3 ( 2x + 2 ) = 15
9x-6x-6=15
3x=15+6
3x=21
x=21/3
x=7

x + 2 ( x + 3 ) = 45 
x+2x+6=45
3x=45-6
3x=39
x=39/3
x=13

4x + 13 = 2x + 17
4x-2x=17-13
2x=4
x=4/2
x=2

Answer 2

a) 3x -2x= 150
x=150
b) 9x-6x-6=15
3x=15+6
x=21÷3
x=7
c) x+2x+6=45
3x=45-6
3x=39
x=39/3
x=13
d) 4x-2x=17-13
2x=4
x=4/2
x=2