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P in (-oo:+oo)
42 = 0.06*(1/2)*P // - 0.06*(1/2)*P
42-(0.06*(1/2)*P) = 0
42-0.03*P = 0
42-0.03*P = 0 // - 42
-0.03*P = -42 // : -0.03
P = -42/(-0.03)
P = 1400
P = 1400
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