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25=2y-13
We move all terms to the left:
25-(2y-13)=0
We get rid of parentheses
-2y+13+25=0
We add all the numbers together, and all the variables
-2y+38=0
We move all terms containing y to the left, all other terms to the right
-2y=-38
y=-38/-2
y=+19
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