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p in (-oo:+oo)
p/5 = 7.2 // - 7.2
p/5-7.2 = 0
1/5*p-7.2 = 0 // + 7.2
1/5*p = 7.2 // : 1/5
p = 7.2/1/5
p = 36
p = 36
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