6u+u+2u=18

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Solution for 6u+u+2u=18 equation: 



6u+u+2u=18

We move all terms to the left:

6u+u+2u-(18)=0

We add all the numbers together, and all the variables

9u-18=0

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

9u=18

u=18/9

u=2

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