U-(-u)-3u=-20

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Solution for U-(-u)-3u=-20 equation: 



-(-U)-3U=-20

We move all terms to the left:

-(-U)-3U-(-20)=0

We add all the numbers together, and all the variables

-(-1U)-3U-(-20)=0

We add all the numbers together, and all the variables

-3U-(-1U)+20=0

We get rid of parentheses

-3U+1U+20=0

We add all the numbers together, and all the variables

-2U+20=0

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

-2U=-20

U=-20/-2

U=+10

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