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187=13-y
We move all terms to the left:
187-(13-y)=0
We add all the numbers together, and all the variables
-(-1y+13)+187=0
We get rid of parentheses
1y-13+187=0
We add all the numbers together, and all the variables
y+174=0
We move all terms containing y to the left, all other terms to the right
y=-174
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