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13=4u-3
We move all terms to the left:
13-(4u-3)=0
We get rid of parentheses
-4u+3+13=0
We add all the numbers together, and all the variables
-4u+16=0
We move all terms containing u to the left, all other terms to the right
-4u=-16
u=-16/-4
u=+4
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