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-y+7=y+21
We move all terms to the left:
-y+7-(y+21)=0
We add all the numbers together, and all the variables
-1y-(y+21)+7=0
We get rid of parentheses
-1y-y-21+7=0
We add all the numbers together, and all the variables
-2y-14=0
We move all terms containing y to the left, all other terms to the right
-2y=14
y=14/-2
y=-7
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