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10(u-99)=10
We move all terms to the left:
10(u-99)-(10)=0
We multiply parentheses
10u-990-10=0
We add all the numbers together, and all the variables
10u-1000=0
We move all terms containing u to the left, all other terms to the right
10u=1000
u=1000/10
u=100
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