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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)
(36*x+325)/(x+10) = 34.5 // - 34.5
(36*x+325)/(x+10)-34.5 = 0
(36*x+325)/(x+10)+(-34.5*(x+10))/(x+10) = 0
36*x-34.5*(x+10)+325 = 0
1.5*x-20 = 0
(1.5*x-20)/(x+10) = 0
(1.5*x-20)/(x+10) = 0 // * x+10
1.5*x-20 = 0
1.5*x-20 = 0 // + 20
1.5*x = 20 // : 1.5
x = 20/1.5
x = 13.33333333
x = 13.33333333
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