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4-9=-2q
We move all terms to the left:
4-9-(-2q)=0
We add all the numbers together, and all the variables
-(-2q)-5=0
We get rid of parentheses
2q-5=0
We move all terms containing q to the left, all other terms to the right
2q=5
q=5/2
q=2+1/2
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