3.q=-21

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Solution for 3.q=-21 equation: 



3.q=-21

We move all terms to the left:

3.q-(-21)=0

We add all the numbers together, and all the variables

3.q+21=0

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

3.q=-21

q=-21/3.

q=-7

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