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65-8z=3(z-4)
We move all terms to the left:
65-8z-(3(z-4))=0
We calculate terms in parentheses: -(3(z-4)), so:We get rid of parentheses
3(z-4)
We multiply parentheses
3z-12
Back to the equation:
-(3z-12)
-8z-3z+12+65=0
We add all the numbers together, and all the variables
-11z+77=0
We move all terms containing z to the left, all other terms to the right
-11z=-77
z=-77/-11
z=+7
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