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4(z+12)=91
We move all terms to the left:
4(z+12)-(91)=0
We multiply parentheses
4z+48-91=0
We add all the numbers together, and all the variables
4z-43=0
We move all terms containing z to the left, all other terms to the right
4z=43
z=43/4
z=10+3/4
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