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15+y=51-y
We move all terms to the left:
15+y-(51-y)=0
We add all the numbers together, and all the variables
y-(-1y+51)+15=0
We get rid of parentheses
y+1y-51+15=0
We add all the numbers together, and all the variables
2y-36=0
We move all terms containing y to the left, all other terms to the right
2y=36
y=36/2
y=18
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