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15=8-z
We move all terms to the left:
15-(8-z)=0
We add all the numbers together, and all the variables
-(-1z+8)+15=0
We get rid of parentheses
1z-8+15=0
We add all the numbers together, and all the variables
z+7=0
We move all terms containing z to the left, all other terms to the right
z=-7
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