2x-6+7x=21

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Solution for 2x-6+7x=21 equation: 



2x-6+7x=21

We move all terms to the left:

2x-6+7x-(21)=0

We add all the numbers together, and all the variables

9x-27=0

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

9x=27

x=27/9

x=3

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