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1+2q-4q=-4q+9
We move all terms to the left:
1+2q-4q-(-4q+9)=0
We add all the numbers together, and all the variables
-2q-(-4q+9)+1=0
We get rid of parentheses
-2q+4q-9+1=0
We add all the numbers together, and all the variables
2q-8=0
We move all terms containing q to the left, all other terms to the right
2q=8
q=8/2
q=4
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