Question

Resolva as equações:
A)2x+7=x
B)4x+20=7x
C)8x+7=4x-13
D)6(x+8)=3(x-6)

Answer 1

A) 2x+7=x
7=x-2x
7=-x      (-1)
-7=x

B) 4x+20=7x
20=7x-4x
20=3x
20/3=x
x=6,666...

C)8x-7=3x-13
8x-3x=-13+7
5x=-6
x=-6/5

D)6(x+8)=3(x-6)                   <- aqui temos que aplicar a distributiva
6x+48=3x-18
6x-3x=-18-48
3x=-66
x=-22