Question

resolva:
a. 10+2x-8=12
b. 5. (x-8) = 100
c. 3.(2x -8) +12=60

Answer 1

a)                           
10+2x-8=12
10+2x-8-12=0
2x-10=0
x=10/2
x=5

b)
5(x-8)=100
5x-40-100=0
5x-140=0
x=140/5
x=28

c)
3(2x-8)+12=60
6x-24+12-60=0
6x-84=0
x=84/6
x=14