78+u=2u

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Solution for 78+u=2u equation: 



78+u=2u

We move all terms to the left:

78+u-(2u)=0

We add all the numbers together, and all the variables

-1u+78=0

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

-u=-78

u=-78/-1

u=+78

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