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200-2q=20+4q

We move all terms to the left:

200-2q-(20+4q)=0

We add all the numbers together, and all the variables

-2q-(4q+20)+200=0

We get rid of parentheses

-2q-4q-20+200=0

We add all the numbers together, and all the variables

-6q+180=0

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

-6q=-180

q=-180/-6

q=+30

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