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y/20-2=-42
We move all terms to the left:
y/20-2-(-42)=0
We add all the numbers together, and all the variables
y/20+40=0
We multiply all the terms by the denominator
y+40*20=0
We add all the numbers together, and all the variables
y+800=0
We move all terms containing y to the left, all other terms to the right
y=-800
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