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P in (-oo:+oo)
(4/5)*P-4 = 2/3 // - 2/3
(4/5)*P-(2/3)-4 = 0
(4/5)*P-2/3-4 = 0
4/5*P-14/3 = 0 // + 14/3
4/5*P = 14/3 // : 4/5
P = 14/3/4/5
P = 35/6
P = 35/6
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