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d in (-oo:+oo)
5*(3-2*d) = -65 // + 65
5*(3-2*d)+65 = 0
5*(3-2*d)+65 = 0
80-10*d = 0
80-10*d = 0
80-10*d = 0 // - 80
-10*d = -80 // : -10
d = -80/(-10)
d = 8
d = 8
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