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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
77/20-63/20*d = 0
77/20-63/20*d = 0
77/20-63/20*d = 0 // - 77/20
-63/20*d = -77/20 // : -63/20
d = -77/20/(-63/20)
d = 11/9
d = 11/9
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