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64-7z=3(z-2)
We move all terms to the left:
64-7z-(3(z-2))=0
We calculate terms in parentheses: -(3(z-2)), so:We get rid of parentheses
3(z-2)
We multiply parentheses
3z-6
Back to the equation:
-(3z-6)
-7z-3z+6+64=0
We add all the numbers together, and all the variables
-10z+70=0
We move all terms containing z to the left, all other terms to the right
-10z=-70
z=-70/-10
z=+7
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