(30+5x)/(-3+x)=-4

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Solution for (30+5x)/(-3+x)=-4 equation: 


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

x in (-oo:3) U (3:+oo)

(5*x+30)/(x-3) = -4 // + 4

(5*x+30)/(x-3)+4 = 0

(5*x+30)/(x-3)+(4*(x-3))/(x-3) = 0

4*(x-3)+5*x+30 = 0

9*x+18 = 0

(9*x+18)/(x-3) = 0

(9*x+18)/(x-3) = 0 // * x-3

9*x+18 = 0

9*x+18 = 0 // - 18

9*x = -18 // : 9

x = -18/9

x = -2

x = -2

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