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d in (-oo:+oo)
(-3/4)*(d+3) = (4/5)*(3*d-2) // - (4/5)*(3*d-2)
(-3/4)*(d+3)-((4/5)*(3*d-2)) = 0
(-3/4)*(d+3)+(-4/5)*(3*d-2) = 0
-3/4*(d+3)-4/5*(3*d-2) = 0
-3/4*(d+3)-4/5*(3*d-2) = 0
-63/20*d-13/20 = 0
-63/20*d-13/20 = 0
-63/20*d-13/20 = 0 // + 13/20
-63/20*d = 13/20 // : -63/20
d = 13/20/(-63/20)
d = -13/63
d = -13/63
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