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P in (-oo:+oo)
(4/9)*P = -8/7 // + -8/7
(4/9)*P-(-8/7) = 0
(4/9)*P+8/7 = 0
4/9*P+8/7 = 0 // - 8/7
4/9*P = -8/7 // : 4/9
P = -8/7/4/9
P = -18/7
P = -18/7
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