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