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d in (-oo:+oo)
5*d-((1/2)*(2*d-4)) = (-5/4)*(d+4) // - (-5/4)*(d+4)
5*d-((1/2)*(2*d-4))-((-5/4)*(d+4)) = 0
(-1/2)*(2*d-4)+(5/4)*(d+4)+5*d = 0
5/4*(d+4)-1/2*(2*d-4)+5*d = 0
5/4*(d+4)-1/2*(2*d-4)+5*d = 0
1/4*d+5*d+7 = 0
21/4*d+7 = 0
21/4*d+7 = 0
21/4*d+7 = 0 // - 7
21/4*d = -7 // : 21/4
d = -7/21/4
d = -4/3
d = -4/3
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