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23=128-y
We move all terms to the left:
23-(128-y)=0
We add all the numbers together, and all the variables
-(-1y+128)+23=0
We get rid of parentheses
1y-128+23=0
We add all the numbers together, and all the variables
y-105=0
We move all terms containing y to the left, all other terms to the right
y=105
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