q+2q=21

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Solution for q+2q=21 equation: 



q+2q=21

We move all terms to the left:

q+2q-(21)=0

We add all the numbers together, and all the variables

3q-21=0

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

3q=21

q=21/3

q=7

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