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p in (-oo:+oo)
(-2/5)*p = 7/9 // - 7/9
(-2/5)*p-(7/9) = 0
(-2/5)*p-7/9 = 0
-2/5*p-7/9 = 0 // + 7/9
-2/5*p = 7/9 // : -2/5
p = 7/9/(-2/5)
p = -35/18
p = -35/18
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