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x in (-oo:+oo)
p = (3*x)/q-d // - (3*x)/q-d
d+p-((3*x)/q) = 0
d+p-3*q^-1*x = 0
d+p-3*q^-1*x = 0 // - d+p
-3*q^-1*x = -(d+p) // : -3*q^-1
x = (-(d+p))/(-3*q^-1)
x = (1/3)*q*(d+p)
x = (1/3)*q*(d+p)
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