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-9u=-8u-5
We move all terms to the left:
-9u-(-8u-5)=0
We get rid of parentheses
-9u+8u+5=0
We add all the numbers together, and all the variables
-1u+5=0
We move all terms containing u to the left, all other terms to the right
-u=-5
u=-5/-1
u=+5
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