Question

Resolva essas equações.

a) 20-2x=100
b) 3x-2x=600
c) 2(x-1)-3=25

Answer 1

a )
-2× = 100- 20
- 2x = 80 (-1)
2x = -80
x = -80/2
x = -40

b) 1x =600
x= 600


c) 2x - 2 -3 = 25
2x - 5 = 25
2x = 25 + 5
2x = 30
x= 30/2
x = 15