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d in (-oo:+oo)
(-3/5)*d+1 = -16/5 // + -16/5
(-3/5)*d-(-16/5)+1 = 0
(-3/5)*d+16/5+1 = 0
21/5-3/5*d = 0 // - 21/5
-3/5*d = -21/5 // : -3/5
d = -21/5/(-3/5)
d = 7
d = 7
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