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d in (-oo:+oo)
81/2 = 3*d+(1/4)*d+8 // - 3*d+(1/4)*d+8
81/2-(3*d)-((1/4)*d)-8 = 0
(-1/4)*d-3*d+81/2-8 = 0
65/2-13/4*d = 0 // - 65/2
-13/4*d = -65/2 // : -13/4
d = -65/2/(-13/4)
d = 10
d = 10
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