2u+6u=81

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Solution for 2u+6u=81 equation: 



2u+6u=81

We move all terms to the left:

2u+6u-(81)=0

We add all the numbers together, and all the variables

8u-81=0

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

8u=81

u=81/8

u=10+1/8

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