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(b+d)/(4b+4d)-(b+2d)/(2d-5b)=1/4-(b+2d)/(2d-5b)=(2d-5b-b-2d)/4(2d-5b)=-3b/2(2d-5b)
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(b+d)/(4b+4d)-(b+2d)/(2d-5b)=1/4-(b+2d)/(2d-5b)=(2d-5b-b-2d)/4(2d-5b)=-3b/2(2d-5b)