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21+3=y+11
We move all terms to the left:
21+3-(y+11)=0
We add all the numbers together, and all the variables
-(y+11)+24=0
We get rid of parentheses
-y-11+24=0
We add all the numbers together, and all the variables
-1y+13=0
We move all terms containing y to the left, all other terms to the right
-y=-13
y=-13/-1
y=+13
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