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Well, what do you get when you isolate x in
-x-y=-8

im not sure

Well.
step 1: add y to both sides
step 2:divide both sides by -1

-x -y= -8
1 1
-x = -7

Wheres y?
-x-y=-8
add y to both sides
-x=-8-y
divide both sides by -1
x=8+y

x=8+y
/1 /1

We're finished, you substitute 8+y