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d in (-oo:+oo)
5-(6*d) = (-3/5)*d+223/50 // - (-3/5)*d+223/50
5-(6*d)-((-3/5)*d)-(223/50) = 0
(3/5)*d-6*d-223/50+5 = 0
27/50-27/5*d = 0 // - 27/50
-27/5*d = -27/50 // : -27/5
d = -27/50/(-27/5)
d = 1/10
d = 1/10
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