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20-y/2=15
We move all terms to the left:
20-y/2-(15)=0
We add all the numbers together, and all the variables
-y/2+5=0
We multiply all the terms by the denominator
-y+5*2=0
We add all the numbers together, and all the variables
-1y+10=0
We move all terms containing y to the left, all other terms to the right
-y=-10
y=-10/-1
y=+10
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