u-u+6u+2u-6u=42

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Solution for u-u+6u+2u-6u=42 equation: 



u-u+6u+2u-6u=42

We move all terms to the left:

u-u+6u+2u-6u-(42)=0

We add all the numbers together, and all the variables

2u-42=0

We move all terms containing u to the left, all other terms to the right

2u=42

u=42/2

u=21

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