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4u+13+13u=-15+19u
We move all terms to the left:
4u+13+13u-(-15+19u)=0
We add all the numbers together, and all the variables
4u+13u-(19u-15)+13=0
We add all the numbers together, and all the variables
17u-(19u-15)+13=0
We get rid of parentheses
17u-19u+15+13=0
We add all the numbers together, and all the variables
-2u+28=0
We move all terms containing u to the left, all other terms to the right
-2u=-28
u=-28/-2
u=+14
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