P=80-4/5x

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Solution for P=80-4/5x equation: 


x in (-oo:+oo)

P = 80-((4/5)*x) // - 80-((4/5)*x)

P+(4/5)*x-80 = 0

P+4/5*x-80 = 0 // - P-80

4/5*x = -(P-80) // : 4/5

x = (-(P-80))/4/5

x = 5/4*(80-P)

x = 5/4*(80-P)

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