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-3(23-z)=51
We move all terms to the left:
-3(23-z)-(51)=0
We add all the numbers together, and all the variables
-3(-1z+23)-51=0
We multiply parentheses
3z-69-51=0
We add all the numbers together, and all the variables
3z-120=0
We move all terms containing z to the left, all other terms to the right
3z=120
z=120/3
z=40
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