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z/15-12=130
We move all terms to the left:
z/15-12-(130)=0
We add all the numbers together, and all the variables
z/15-142=0
We multiply all the terms by the denominator
z-142*15=0
We add all the numbers together, and all the variables
z-2130=0
We move all terms containing z to the left, all other terms to the right
z=2130
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