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56=7(z-78)
We move all terms to the left:
56-(7(z-78))=0
We calculate terms in parentheses: -(7(z-78)), so:We get rid of parentheses
7(z-78)
We multiply parentheses
7z-546
Back to the equation:
-(7z-546)
-7z+546+56=0
We add all the numbers together, and all the variables
-7z+602=0
We move all terms containing z to the left, all other terms to the right
-7z=-602
z=-602/-7
z=+86
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