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y/12+42=45
We move all terms to the left:
y/12+42-(45)=0
We add all the numbers together, and all the variables
y/12-3=0
We multiply all the terms by the denominator
y-3*12=0
We add all the numbers together, and all the variables
y-36=0
We move all terms containing y to the left, all other terms to the right
y=36
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