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y-(-3y)=4y
We move all terms to the left:
y-(-3y)-(4y)=0
We add all the numbers together, and all the variables
-3y-(-3y)=0
We get rid of parentheses
-3y+3y=0
We add all the numbers together, and all the variables
=0
y=0/1
y=0
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