Question

3x=90 ?
2x+10=70 ?
2x+80=3x
x+50=3x+20

Answer 1

3x=90
90/3=x
x=30

2x+10=70
2x=70-10
2x=60
x=60/2
x=30

2x+80=3x
80=3x-2x
80=x

x+50=3x+20
x-3x=20-50
-2x=-30.(-1)
2x=30
x=30/2
x=15