3x+9=40-4x

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Solution for 3x+9=40-4x equation: 



3x+9=40-4x

We move all terms to the left:

3x+9-(40-4x)=0

We add all the numbers together, and all the variables

3x-(-4x+40)+9=0

We get rid of parentheses

3x+4x-40+9=0

We add all the numbers together, and all the variables

7x-31=0

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

7x=31

x=31/7

x=4+3/7

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