30-20u=u+21

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Solution for 30-20u=u+21 equation: 



30-20u=u+21

We move all terms to the left:

30-20u-(u+21)=0

We get rid of parentheses

-20u-u-21+30=0

We add all the numbers together, and all the variables

-21u+9=0

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

-21u=-9

u=-9/-21

u=3/7

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