X+9=40-20x

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Solution for X+9=40-20x equation: 



X+9=40-20X

We move all terms to the left:

X+9-(40-20X)=0

We add all the numbers together, and all the variables

X-(-20X+40)+9=0

We get rid of parentheses

X+20X-40+9=0

We add all the numbers together, and all the variables

21X-31=0

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

21X=31

X=31/21

X=1+10/21

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