15u-9u=42

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Solution for 15u-9u=42 equation: 



15u-9u=42

We move all terms to the left:

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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