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D( x )
x+10 = 0
x+10 = 0
x+10 = 0
x+10 = 0 // - 10
x = -10
x in (-oo:-10) U (-10:+oo)
(100*x)/(x+10)+70 = 0
(100*x)/(x+10)+(70*(x+10))/(x+10) = 0
70*(x+10)+100*x = 0
170*x+700 = 0
(170*x+700)/(x+10) = 0
(170*x+700)/(x+10) = 0 // * x+10
170*x+700 = 0
170*x+700 = 0 // - 700
170*x = -700 // : 170
x = -700/170
x = -70/17
x = -70/17
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