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5-9u=-8u-2
We move all terms to the left:
5-9u-(-8u-2)=0
We get rid of parentheses
-9u+8u+2+5=0
We add all the numbers together, and all the variables
-1u+7=0
We move all terms containing u to the left, all other terms to the right
-u=-7
u=-7/-1
u=+7
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