3x+2x+7x=84

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Solution for 3x+2x+7x=84 equation: 



3x+2x+7x=84

We move all terms to the left:

3x+2x+7x-(84)=0

We add all the numbers together, and all the variables

12x-84=0

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

12x=84

x=84/12

x=7

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