2u-u-u+u=20

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Solution for 2u-u-u+u=20 equation: 



2u-u-u+u=20

We move all terms to the left:

2u-u-u+u-(20)=0

We add all the numbers together, and all the variables

u-20=0

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

u=20

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