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y=3y+2100
We move all terms to the left:
y-(3y+2100)=0
We get rid of parentheses
y-3y-2100=0
We add all the numbers together, and all the variables
-2y-2100=0
We move all terms containing y to the left, all other terms to the right
-2y=2100
y=2100/-2
y=-1050
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