A=800+20x-1/2X2

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Solution for A=800+20x-1/2X2 equation: 


x in (-oo:+oo)

A = 20*x-((1/2)*X^2)+800 // - 20*x-((1/2)*X^2)+800

A+(1/2)*X^2-(20*x)-800 = 0

A+(1/2)*X^2-20*x-800 = 0

A+1/2*X^2-20*x-800 = 0 // - A+1/2*X^2-800

-20*x = -(A+1/2*X^2-800) // : -20

x = (-(A+1/2*X^2-800))/(-20)

x = (800-A-(1/2*X^2))/(-20)

x = (800-A-(1/2*X^2))/(-20)

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