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3=-z/12
We move all terms to the left:
3-(-z/12)=0
We get rid of parentheses
z/12+3=0
We multiply all the terms by the denominator
z+3*12=0
We add all the numbers together, and all the variables
z+36=0
We move all terms containing z to the left, all other terms to the right
z=-36
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