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d in (-oo:+oo)
6*d-((1/2)*(2*d-4)) = (-5/4)*(d+4) // - (-5/4)*(d+4)
6*d-((1/2)*(2*d-4))-((-5/4)*(d+4)) = 0
(-1/2)*(2*d-4)+(5/4)*(d+4)+6*d = 0
5/4*(d+4)-1/2*(2*d-4)+6*d = 0
5/4*(d+4)-1/2*(2*d-4)+6*d = 0
1/4*d+6*d+7 = 0
25/4*d+7 = 0
25/4*d+7 = 0
25/4*d+7 = 0 // - 7
25/4*d = -7 // : 25/4
d = -7/25/4
d = -28/25
d = -28/25
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