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13=4u-15
We move all terms to the left:
13-(4u-15)=0
We get rid of parentheses
-4u+15+13=0
We add all the numbers together, and all the variables
-4u+28=0
We move all terms containing u to the left, all other terms to the right
-4u=-28
u=-28/-4
u=+7
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