7b(2b+3)-(b+6)(b-5)=14b2+21b-(b2-5b+6b-30)=14b2+21b-b2+5b-6b+30=13b2+20b+30
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7b(2b+3)-(b+6)(b-5)=14b2+21b-(b2-5b+6b-30)=14b2+21b-b2+5b-6b+30=13b2+20b+30