Question

A)3x+5x=24
B)2x-3x=-4x-9
C)-7+2x=-14
D)-4x+8=-5x-4
E)7x-8=3x-9
F)5x-3x+7=5-x
3)respostas
( ) x=-3
( ) x=3
( ) x=-2
3
( ) x=7 ou 3,5
2
( ) x=-12
( ) x=-1
4​

Answer 1

a) 3x + 5x = 24

8x = 24

x = 24/8 (é a mesma coisa que 24 ÷ 8)

x= 3

b) 2x - 3x = -4x - 9

2x - 3x + 4x = -9

2x + x = -9

x= -9

c) -7 + 2x = -14

2x = -14 + 7

2x = -7

x = -7/2

x= -3,5

d) -4x + 8 = -5x - 4

-4x + 5x = -8 - 4

x= -12

e) 7x -8 = 3x -9

7x - 3x = -9 + 8

4x = -1

x = -1/4

x= -0,25

f) 5x - 3x + 7 = 5 -x

5x - 3x + x = 5 - 7

2x + x = -2

3x = -2

x = -2/3

x= -0,666...