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-20+q=20-4q
We move all terms to the left:
-20+q-(20-4q)=0
We add all the numbers together, and all the variables
q-(-4q+20)-20=0
We get rid of parentheses
q+4q-20-20=0
We add all the numbers together, and all the variables
5q-40=0
We move all terms containing q to the left, all other terms to the right
5q=40
q=40/5
q=8
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