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d in (-oo:+oo)
5-2*d-(3*d) = 35/4 // - 35/4
5-2*d-(3*d)-(35/4) = 0
5-2*d-3*d-35/4 = 0
-5*d-15/4 = 0 // + 15/4
-5*d = 15/4 // : -5
d = 15/4/(-5)
d = -3/4
d = -3/4
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