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(64-y)=13
We move all terms to the left:
(64-y)-(13)=0
We add all the numbers together, and all the variables
(-1y+64)-13=0
We get rid of parentheses
-1y+64-13=0
We add all the numbers together, and all the variables
-1y+51=0
We move all terms containing y to the left, all other terms to the right
-y=-51
y=-51/-1
y=+51
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