Question

Resolva:

a) 2x-7=5(x-2)

b) 2x-5=9+2x

c) x+x+2=2(x+1)

d) 2x+5(x-2)=-10

e) 3(2x-4)=2(3x-6)

Answer 1

A) 2x-7=5(x-2)
2x-7=5x-2
2x-5x-7+2=0
-3x-5=0 multiplica por -1
3x+5=0
3x=5
x=5/3

B) 2x-5=9+2x
2x-2x-5-9=0
0-14=0
-14=0

C) x+x+2=2(x+1)
2x+2=2x+2
2x-2x+2-2=0
0=0

D) 2x+5(x-2)=-10
2x+5x+10=-10
7x+10+10=0
7x+20=0
7x=-20
x=-20/7

E) 3(2x-4)=2(3x-6)
6x-12=6x-12
6x-6x-12+12=0
0=0