x+6x+7=21

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



x+6x+7=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

7x-14=0

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

7x=14

x=14/7

x=2

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