3x-40=9x+40

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



3x-40=9x+40

We move all terms to the left:

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

We get rid of parentheses

3x-9x-40-40=0

We add all the numbers together, and all the variables

-6x-80=0

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

-6x=80

x=80/-6

x=-13+1/3

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