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-9(u-8)=7u+40
We move all terms to the left:
-9(u-8)-(7u+40)=0
We multiply parentheses
-9u-(7u+40)+72=0
We get rid of parentheses
-9u-7u-40+72=0
We add all the numbers together, and all the variables
-16u+32=0
We move all terms containing u to the left, all other terms to the right
-16u=-32
u=-32/-16
u=+2
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