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p in (-oo:+oo)
(-2/45)*p = 7/25 // - 7/25
(-2/45)*p-(7/25) = 0
(-2/45)*p-7/25 = 0
-2/45*p-7/25 = 0 // + 7/25
-2/45*p = 7/25 // : -2/45
p = 7/25/(-2/45)
p = -63/10
p = -63/10
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