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10+9u=5u-10
We move all terms to the left:
10+9u-(5u-10)=0
We get rid of parentheses
9u-5u+10+10=0
We add all the numbers together, and all the variables
4u+20=0
We move all terms containing u to the left, all other terms to the right
4u=-20
u=-20/4
u=-5
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