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-7-10u=9-u-7u
We move all terms to the left:
-7-10u-(9-u-7u)=0
We add all the numbers together, and all the variables
-10u-(-8u+9)-7=0
We get rid of parentheses
-10u+8u-9-7=0
We add all the numbers together, and all the variables
-2u-16=0
We move all terms containing u to the left, all other terms to the right
-2u=16
u=16/-2
u=-8
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