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P in (-oo:+oo)
P/3-7.2 = 3.8 // - 3.8
P/3-7.2-3.8 = 0
1/3*P-11 = 0 // + 11
1/3*P = 11 // : 1/3
P = 11/1/3
P = 33
P = 33
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