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8=4(z-85)
We move all terms to the left:
8-(4(z-85))=0
We calculate terms in parentheses: -(4(z-85)), so:We get rid of parentheses
4(z-85)
We multiply parentheses
4z-340
Back to the equation:
-(4z-340)
-4z+340+8=0
We add all the numbers together, and all the variables
-4z+348=0
We move all terms containing z to the left, all other terms to the right
-4z=-348
z=-348/-4
z=+87
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