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D( x )
250-(50*x) = 0
250-(50*x) = 0
250-(50*x) = 0
250-50*x = 0
250-50*x = 0 // - 250
-50*x = -250 // : -50
x = -250/(-50)
x = 5
x in (-oo:5) U (5:+oo)
3.4 = (200*x)/(250-(50*x)) // - (200*x)/(250-(50*x))
3.4-((200*x)/(250-(50*x))) = 0
3.4-200*x*(250-50*x)^-1 = 0
(-200*x)/(250-50*x)+3.4 = 0
(-200*x)/(250-50*x)+(3.4*(250-50*x))/(250-50*x) = 0
3.4*(250-50*x)-200*x = 0
850-370*x = 0
(850-370*x)/(250-50*x) = 0
(850-370*x)/(250-50*x) = 0 // * 250-50*x
850-370*x = 0
850-370*x = 0 // - 850
-370*x = -850 // : -370
x = -850/(-370)
x = 85/37
x = 85/37
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