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p in (-oo:+oo)
3*(p-4) = 4/5 // - 4/5
3*(p-4)-(4/5) = 0
3*(p-4)-4/5 = 0
(3*5*(p-4))/5-4/5 = 0
3*5*(p-4)-4 = 0
15*p-64 = 0
(15*p-64)/5 = 0
(15*p-64)/5 = 0 // * 5
15*p-64 = 0
15*p-64 = 0 // + 64
15*p = 64 // : 15
p = 64/15
p = 64/15
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