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4u+13=6u-7
We move all terms to the left:
4u+13-(6u-7)=0
We get rid of parentheses
4u-6u+7+13=0
We add all the numbers together, and all the variables
-2u+20=0
We move all terms containing u to the left, all other terms to the right
-2u=-20
u=-20/-2
u=+10
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