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z=42(7z+5)
We move all terms to the left:
z-(42(7z+5))=0
We calculate terms in parentheses: -(42(7z+5)), so:We get rid of parentheses
42(7z+5)
We multiply parentheses
294z+210
Back to the equation:
-(294z+210)
z-294z-210=0
We add all the numbers together, and all the variables
-293z-210=0
We move all terms containing z to the left, all other terms to the right
-293z=210
z=210/-293
z=-210/293
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