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(-u/7)+2=(-13)
We move all terms to the left:
(-u/7)+2-((-13))=0
We add all the numbers together, and all the variables
(-u/7)+15=0
We get rid of parentheses
-u/7+15=0
We multiply all the terms by the denominator
-u+15*7=0
We add all the numbers together, and all the variables
-1u+105=0
We move all terms containing u to the left, all other terms to the right
-u=-105
u=-105/-1
u=+105
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