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9u-14u-3u+13u+-8u=-15
We move all terms to the left:
9u-14u-3u+13u+-8u-(-15)=0
We add all the numbers together, and all the variables
-3u+15=0
We move all terms containing u to the left, all other terms to the right
-3u=-15
u=-15/-3
u=+5
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