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128+3y=4y-4
We move all terms to the left:
128+3y-(4y-4)=0
We get rid of parentheses
3y-4y+4+128=0
We add all the numbers together, and all the variables
-1y+132=0
We move all terms containing y to the left, all other terms to the right
-y=-132
y=-132/-1
y=+132
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