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93=180-z
We move all terms to the left:
93-(180-z)=0
We add all the numbers together, and all the variables
-(-1z+180)+93=0
We get rid of parentheses
1z-180+93=0
We add all the numbers together, and all the variables
z-87=0
We move all terms containing z to the left, all other terms to the right
z=87
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