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15u=9u+42
We move all terms to the left:
15u-(9u+42)=0
We get rid of parentheses
15u-9u-42=0
We add all the numbers together, and all the variables
6u-42=0
We move all terms containing u to the left, all other terms to the right
6u=42
u=42/6
u=7
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