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d in (-oo:+oo)
d/2-((d-5)/4) = 9/4 // - 9/4
d/2-((d-5)/4)-(9/4) = 0
d/2-((d-5)/4)-9/4 = 0
(-1*(d-5))/4+d/2-9/4 = 0
(-1*2*(d-5))/(2*4)+(4*d)/(2*4)+(-9*2)/(2*4) = 0
4*d-1*2*(d-5)-9*2 = 0
2*d-18+10 = 0
2*d-8 = 0
(2*d-8)/(2*4) = 0
(2*d-8)/(2*4) = 0 // * 2*4
2*d-8 = 0
2*d-8 = 0 // + 8
2*d = 8 // : 2
d = 8/2
d = 4
d = 4
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