21u-20u-u+10u=50

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Solution for 21u-20u-u+10u=50 equation: 



21u-20u-u+10u=50

We move all terms to the left:

21u-20u-u+10u-(50)=0

We add all the numbers together, and all the variables

10u-50=0

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

10u=50

u=50/10

u=5

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