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p in (-oo:+oo)
(2/5)*p-(3/10) = (7/15)*p-1 // - (7/15)*p-1
(2/5)*p-((7/15)*p)-(3/10)+1 = 0
(2/5)*p+(-7/15)*p-3/10+1 = 0
7/10-1/15*p = 0 // - 7/10
-1/15*p = -7/10 // : -1/15
p = -7/10/(-1/15)
p = 21/2
p = 21/2
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