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d in (-oo:+oo)
(3*d+1)/3 = 6*d-3 // - 6*d-3
(3*d+1)/3-(6*d)+3 = 0
(3*d+1)/3-6*d+3 = 0
(3*d+1)/3+(-6*3*d)/3+(3^2)/3 = 0
3*d-6*3*d+1+9 = 0
(3-18)*d+1+9 = 0
((3-18)*d+1+9)/3 = 0
((3-18)*d+1+9)/3 = 0 // * 3
(3-18)*d+1+9 = 0
(3-18)*d+1+9 = 0 // - 1+9
(3-18)*d = -(1+9) // : 3-18
d = (-(1+9))/(3-18)
d = -((3-18)^-1*(1+9))
d = -((3-18)^-1*(1+9))
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