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9=u/3.75+6
We move all terms to the left:
9-(u/3.75+6)=0
We get rid of parentheses
-u/3.75-6+9=0
We multiply all the terms by the denominator
-u-6*3.75+9*3.75=0
We add all the numbers together, and all the variables
-1u+11.25=0
We move all terms containing u to the left, all other terms to the right
-u=-11.25
u=-11.25/-1
u=11+0.25/1
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