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13u=36+7u
We move all terms to the left:
13u-(36+7u)=0
We add all the numbers together, and all the variables
13u-(7u+36)=0
We get rid of parentheses
13u-7u-36=0
We add all the numbers together, and all the variables
6u-36=0
We move all terms containing u to the left, all other terms to the right
6u=36
u=36/6
u=6
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