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287=136-y
We move all terms to the left:
287-(136-y)=0
We add all the numbers together, and all the variables
-(-1y+136)+287=0
We get rid of parentheses
1y-136+287=0
We add all the numbers together, and all the variables
y+151=0
We move all terms containing y to the left, all other terms to the right
y=-151
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