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-9u-10=-u+10
We move all terms to the left:
-9u-10-(-u+10)=0
We add all the numbers together, and all the variables
-9u-(-1u+10)-10=0
We get rid of parentheses
-9u+1u-10-10=0
We add all the numbers together, and all the variables
-8u-20=0
We move all terms containing u to the left, all other terms to the right
-8u=20
u=20/-8
u=-2+1/2
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