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p in (-oo:+oo)
(p+3)/10 = 4 // - 4
(p+3)/10-4 = 0
(p+3)/10+(-4*10)/10 = 0
p-4*10+3 = 0
p-37 = 0
(p-37)/10 = 0
(p-37)/10 = 0 // * 10
p-37 = 0
p-37 = 0 // + 37
p = 37
p = 37
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