2x+3x+7x+21=0

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Solution for 2x+3x+7x+21=0 equation: 



2x+3x+7x+21=0

We add all the numbers together, and all the variables

12x+21=0

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

12x=-21

x=-21/12

x=-1+3/4

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