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y=-2y+4
We move all terms to the left:
y-(-2y+4)=0
We get rid of parentheses
y+2y-4=0
We add all the numbers together, and all the variables
3y-4=0
We move all terms containing y to the left, all other terms to the right
3y=4
y=4/3
y=1+1/3
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