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-15=8z+7
We move all terms to the left:
-15-(8z+7)=0
We get rid of parentheses
-8z-7-15=0
We add all the numbers together, and all the variables
-8z-22=0
We move all terms containing z to the left, all other terms to the right
-8z=22
z=22/-8
z=-2+3/4
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