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y/2-12=-15
We move all terms to the left:
y/2-12-(-15)=0
We add all the numbers together, and all the variables
y/2+3=0
We multiply all the terms by the denominator
y+3*2=0
We add all the numbers together, and all the variables
y+6=0
We move all terms containing y to the left, all other terms to the right
y=-6
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