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(8-z)+(3z+7)=0
We add all the numbers together, and all the variables
(-1z+8)+(3z+7)=0
We get rid of parentheses
-1z+3z+8+7=0
We add all the numbers together, and all the variables
2z+15=0
We move all terms containing z to the left, all other terms to the right
2z=-15
z=-15/2
z=-7+1/2
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