8u+u=81

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Solution for 8u+u=81 equation:



8u+u=81
We move all terms to the left:
8u+u-(81)=0
We add all the numbers together, and all the variables
9u-81=0
We move all terms containing u to the left, all other terms to the right
9u=81
u=81/9
u=9

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