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-2-10u=-18-9u
We move all terms to the left:
-2-10u-(-18-9u)=0
We add all the numbers together, and all the variables
-10u-(-9u-18)-2=0
We get rid of parentheses
-10u+9u+18-2=0
We add all the numbers together, and all the variables
-1u+16=0
We move all terms containing u to the left, all other terms to the right
-u=-16
u=-16/-1
u=+16
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