3x=240-9x

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Solution for 3x=240-9x equation: 



3x=240-9x

We move all terms to the left:

3x-(240-9x)=0

We add all the numbers together, and all the variables

3x-(-9x+240)=0

We get rid of parentheses

3x+9x-240=0

We add all the numbers together, and all the variables

12x-240=0

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

12x=240

x=240/12

x=20

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