2x+7x+3=21

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



2x+7x+3=21

We move all terms to the left:

2x+7x+3-(21)=0

We add all the numbers together, and all the variables

9x-18=0

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

9x=18

x=18/9

x=2

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