2x+3+7x=84

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



2x+3+7x=84

We move all terms to the left:

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

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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