20-9u=-20-5u

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Solution for 20-9u=-20-5u equation: 



20-9u=-20-5u

We move all terms to the left:

20-9u-(-20-5u)=0

We add all the numbers together, and all the variables

-9u-(-5u-20)+20=0

We get rid of parentheses

-9u+5u+20+20=0

We add all the numbers together, and all the variables

-4u+40=0

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

-4u=-40

u=-40/-4

u=+10

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