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97=7+-5z
We move all terms to the left:
97-(7+-5z)=0
We add all the numbers together, and all the variables
-(-5z)+97=0
We get rid of parentheses
5z+97=0
We move all terms containing z to the left, all other terms to the right
5z=-97
z=-97/5
z=-19+2/5
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