72=q+21

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Solution for 72=q+21 equation: 



72=q+21

We move all terms to the left:

72-(q+21)=0

We get rid of parentheses

-q-21+72=0

We add all the numbers together, and all the variables

-1q+51=0

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

-q=-51

q=-51/-1

q=+51

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