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30=u/15
We move all terms to the left:
30-(u/15)=0
We add all the numbers together, and all the variables
-(+u/15)+30=0
We get rid of parentheses
-u/15+30=0
We multiply all the terms by the denominator
-u+30*15=0
We add all the numbers together, and all the variables
-1u+450=0
We move all terms containing u to the left, all other terms to the right
-u=-450
u=-450/-1
u=+450
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