Ii dont understand how to solve a system of linear equations using the substitution method

So 8x-7y=-7

-16+12x=14

you can simplify the sceon equation

-8+6x=7

add 8 to both sides

6x=15

divide by 6

x=15/6

subssitute

8 (15/6) - 7y=-7

120/6-7y=-7

20-7y=-7

subtract 20

-7y=-27

divide by - 7

y=27/7

x=15/6

y=27/7