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11-15u=-7+13u
We move all terms to the left:
11-15u-(-7+13u)=0
We add all the numbers together, and all the variables
-15u-(13u-7)+11=0
We get rid of parentheses
-15u-13u+7+11=0
We add all the numbers together, and all the variables
-28u+18=0
We move all terms containing u to the left, all other terms to the right
-28u=-18
u=-18/-28
u=9/14
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