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-1+13u=-15+20u
We move all terms to the left:
-1+13u-(-15+20u)=0
We add all the numbers together, and all the variables
13u-(20u-15)-1=0
We get rid of parentheses
13u-20u+15-1=0
We add all the numbers together, and all the variables
-7u+14=0
We move all terms containing u to the left, all other terms to the right
-7u=-14
u=-14/-7
u=+2
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