(w+3)(2w-a)=bw^2 - w+3c
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(w+3)(2w-a)=bw²-w+3c
2w²-aw+6w-3a=bw²-w+3c
2w²-bw²-aw+w+6w-3a-3c=0
2w²-bw²-aw+7w-3a-3c=0
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