(800+x)((4-(0.01)x/5))=3200

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Solution for (800+x)((4-(0.01)x/5))=3200 equation: 


x in (-oo:+oo)

(x+800)*(4-((0.01*x)/5)) = 3200 // - 3200

(x+800)*(4-((0.01*x)/5))-3200 = 0

(x+800)*(4-0.002*x)-3200 = 0

(x+800)*(4-0.002*x)-3200 = 0

2.4*x-0.002*x^2 = 0

2.4*x-0.002*x^2 = 0

x*(2.4-0.002*x) = 0

2.4-0.002*x = 0 // - 2.4

-0.002*x = -2.4 // : -0.002

x = -2.4/(-0.002)

x = 1200

x*(x-1200) = 0

x*(x-1200) = 0

( x-1200 )

x-1200 = 0 // + 1200

x = 1200

( x )

x = 0

x in { 1200, 0 }

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