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7+8z+5=7z+5
We move all terms to the left:
7+8z+5-(7z+5)=0
We add all the numbers together, and all the variables
8z-(7z+5)+12=0
We get rid of parentheses
8z-7z-5+12=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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