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