21=q+19

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Solution for 21=q+19 equation: 



21=q+19

We move all terms to the left:

21-(q+19)=0

We get rid of parentheses

-q-19+21=0

We add all the numbers together, and all the variables

-1q+2=0

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

-q=-2

q=-2/-1

q=+2

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