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215=56-y
We move all terms to the left:
215-(56-y)=0
We add all the numbers together, and all the variables
-(-1y+56)+215=0
We get rid of parentheses
1y-56+215=0
We add all the numbers together, and all the variables
y+159=0
We move all terms containing y to the left, all other terms to the right
y=-159
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