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6+13u-2u=18+12u
We move all terms to the left:
6+13u-2u-(18+12u)=0
We add all the numbers together, and all the variables
13u-2u-(12u+18)+6=0
We add all the numbers together, and all the variables
11u-(12u+18)+6=0
We get rid of parentheses
11u-12u-18+6=0
We add all the numbers together, and all the variables
-1u-12=0
We move all terms containing u to the left, all other terms to the right
-u=12
u=12/-1
u=-12
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