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23-4z=3(z-4)
We move all terms to the left:
23-4z-(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)
-4z-3z+12+23=0
We add all the numbers together, and all the variables
-7z+35=0
We move all terms containing z to the left, all other terms to the right
-7z=-35
z=-35/-7
z=+5
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