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213=-y+9
We move all terms to the left:
213-(-y+9)=0
We add all the numbers together, and all the variables
-(-1y+9)+213=0
We get rid of parentheses
1y-9+213=0
We add all the numbers together, and all the variables
y+204=0
We move all terms containing y to the left, all other terms to the right
y=-204
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