21=2q+3

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Solution for 21=2q+3 equation: 



21=2q+3

We move all terms to the left:

21-(2q+3)=0

We get rid of parentheses

-2q-3+21=0

We add all the numbers together, and all the variables

-2q+18=0

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

-2q=-18

q=-18/-2

q=+9

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