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p in (-oo:+oo)
(2/5)*p = -4/7 // + -4/7
(2/5)*p-(-4/7) = 0
(2/5)*p+4/7 = 0
2/5*p+4/7 = 0 // - 4/7
2/5*p = -4/7 // : 2/5
p = -4/7/2/5
p = -10/7
p = -10/7
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