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191=4-y
We move all terms to the left:
191-(4-y)=0
We add all the numbers together, and all the variables
-(-1y+4)+191=0
We get rid of parentheses
1y-4+191=0
We add all the numbers together, and all the variables
y+187=0
We move all terms containing y to the left, all other terms to the right
y=-187
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