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d in (-oo:+oo)
1.5*(d+31/2) = -2.4 // + 2.4
1.5*(d+31/2)+2.4 = 0
1.5*(d+31/2)+2.4 = 0
1.5*d+25.65 = 0
1.5*d+25.65 = 0
1.5*d+25.65 = 0 // - 25.65
1.5*d = -25.65 // : 1.5
d = -25.65/1.5
d = -17.1
d = -17.1
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