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d in (-oo:+oo)
4*d+4/5 = -12/5 // + -12/5
4*d+4/5-(-12/5) = 0
4*d+4/5+12/5 = 0
4*d+16/5 = 0 // - 16/5
4*d = -16/5 // : 4
d = -16/5/4
d = -4/5
d = -4/5
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