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0.3(u-100)=60
We move all terms to the left:
0.3(u-100)-(60)=0
We multiply parentheses
0.3u-30-60=0
We add all the numbers together, and all the variables
0.3u-90=0
We move all terms containing u to the left, all other terms to the right
0.3u=90
u=90/0.3
u=300
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