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-15=-z/4-12
We move all terms to the left:
-15-(-z/4-12)=0
We get rid of parentheses
z/4+12-15=0
We multiply all the terms by the denominator
z+12*4-15*4=0
We add all the numbers together, and all the variables
z-12=0
We move all terms containing z to the left, all other terms to the right
z=12
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