Question

7x+13=90
-6(x+1)=30
2(x+5)=16

Answer 1

7x=90-13

7x=77

×=77/7

x=11

-6x-6=30

-6x=30+6

-6x=36

x=36/-6

x=-6

2x+10=16

2x=16-10

2x=6

x=6/2

x=3