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4q-2q-4=-1-21
We move all terms to the left:
4q-2q-4-(-1-21)=0
We add all the numbers together, and all the variables
4q-2q-4-(-22)=0
We add all the numbers together, and all the variables
2q+18=0
We move all terms containing q to the left, all other terms to the right
2q=-18
q=-18/2
q=-9
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