(2-b)(b+3)=2b+6-b²-3b=-b²-b+6
(d+3)(7-d)=7d-d²+21-3d=-d²+4d+21
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(2-b)(b+3)=2b+6-b²-3b=-b²-b+6
(d+3)(7-d)=7d-d²+21-3d=-d²+4d+21