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-88=7z+4z
We move all terms to the left:
-88-(7z+4z)=0
We add all the numbers together, and all the variables
-(+11z)-88=0
We get rid of parentheses
-11z-88=0
We move all terms containing z to the left, all other terms to the right
-11z=88
z=88/-11
z=-8
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