12=3+q

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Solution for 12=3+q equation: 



12=3+q

We move all terms to the left:

12-(3+q)=0

We add all the numbers together, and all the variables

-(q+3)+12=0

We get rid of parentheses

-q-3+12=0

We add all the numbers together, and all the variables

-1q+9=0

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

-q=-9

q=-9/-1

q=+9

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