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13=4u-13
We move all terms to the left:
13-(4u-13)=0
We get rid of parentheses
-4u+13+13=0
We add all the numbers together, and all the variables
-4u+26=0
We move all terms containing u to the left, all other terms to the right
-4u=-26
u=-26/-4
u=6+1/2
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