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p in (-oo:+oo)
-((p-623)/2) = 50 // - 50
-((p-623)/2)-50 = 0
(-1*(p-623))/2-50 = 0
(-1*(p-623))/2+(-50*2)/2 = 0
-1*(p-623)-50*2 = 0
523-p = 0
(523-p)/2 = 0
(523-p)/2 = 0 // * 2
523-p = 0
523-p = 0 // - 523
-p = -523 // * -1
p = 523
p = 523
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