Question

5) calcule x
6) calcule x

Answer 1

a) 5x - 70 = 2x + 20
5x - 2x = 20 + 70
3x = 90
x = 90/3
x = 30

b) 2x = x + 70
2x - x = 70
x= 70

c) 3x + 10 = x + 50
3x - x = 50 + 10
2x = 60
x = 60/2
x = 30