-30=u-20

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Solution for -30=u-20 equation: 



-30=u-20

We move all terms to the left:

-30-(u-20)=0

We get rid of parentheses

-u+20-30=0

We add all the numbers together, and all the variables

-1u-10=0

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

-u=10

u=10/-1

u=-10

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