Question

1)Resolva As equações

A)3x+5-2=2x+12
B)2.(x+2)=12
C)23x-16=14-7x
D)18x-43=65
E)5x-2=4x+1
F)4x+x+6=x+5x

Answer 1

Resposta:

A - 9; B - 4; C - 1; D - 6; E - 3; F = 6

Explicação passo-a-passo:

A -

3x + 5 - 2 = 2x + 12

3x - 2x = 12 - 5 + 2

x = 9

==========================

B -

2(x + 2) = 12

x + 2 = 12 ÷ 2

x + 2 = 6

x = 6 - 2

x = 4

==========================

C -

23x - 16 = 14 - 7x

23x + 7x = 14 + 16

30x = 30

x = 30 ÷ 30

x = 1

==========================

D -

18x - 43 = 65

18x = 65 + 43

18x = 108

x = 6

==========================

E -

5x - 2 = 4x + 1

5x - 4x = 1 + 2

x = 3

==========================

F -

4x + x + 6 = x + 5x

5x + 6 = 6x

5x - 6x = -6

-x = -6

x = 6