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54=-y+199
We move all terms to the left:
54-(-y+199)=0
We add all the numbers together, and all the variables
-(-1y+199)+54=0
We get rid of parentheses
1y-199+54=0
We add all the numbers together, and all the variables
y-145=0
We move all terms containing y to the left, all other terms to the right
y=145
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