expand the expression (3d+1) (5-2d)
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(3d+1)(5-2d)=0
3d(5-2d)+1(5-2d)=0
15d-6d^2+5-2d=0
13d-6d^2+5=0
-6d^2+13d+5=0
6d^2+-13d-5=0
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