15=-21-q

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Solution for 15=-21-q equation: 



15=-21-q

We move all terms to the left:

15-(-21-q)=0

We add all the numbers together, and all the variables

-(-1q-21)+15=0

We get rid of parentheses

1q+21+15=0

We add all the numbers together, and all the variables

q+36=0

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

q=-36

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