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p in (-oo:+oo)
26.54-p = (1/2)*(50-p) // - (1/2)*(50-p)
26.54-((1/2)*(50-p))-p = 0
(-1/2)*(50-p)-p+26.54 = 0
26.54-1/2*(50-p)-p = 0
26.54-1/2*(50-p)-p = 0
26.54-1/2*p-25 = 0
1.54-1/2*p = 0
1.54-1/2*p = 0
1.54-1/2*p = 0 // - 1.54
-1/2*p = -1.54 // : -1/2
p = -1.54/(-1/2)
p = 3.08
p = 3.08
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