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p in (-oo:+oo)
(4/5)*p = -12/15 // + -12/15
(4/5)*p-(-12/15) = 0
(4/5)*p+4/5 = 0
4/5*p+4/5 = 0 // - 4/5
4/5*p = -4/5 // : 4/5
p = -4/5/4/5
p = -1
p = -1
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