d(x+7)=5-4(x+7)=5-4x-28=-4x-23
d(x-3)=5-4(x-3)=5-4x+12=17-4x
d(x+7)-d(x-3)=-4x-23-(17-4x)=-4x-23-17+4x=-40
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d(x+7)=5-4(x+7)=5-4x-28=-4x-23
d(x-3)=5-4(x-3)=5-4x+12=17-4x
d(x+7)-d(x-3)=-4x-23-(17-4x)=-4x-23-17+4x=-40