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-3+y/3=-21
We move all terms to the left:
-3+y/3-(-21)=0
We add all the numbers together, and all the variables
y/3+18=0
We multiply all the terms by the denominator
y+18*3=0
We add all the numbers together, and all the variables
y+54=0
We move all terms containing y to the left, all other terms to the right
y=-54
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