23.3=(130+30x)/(13+x)

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Solution for 23.3=(130+30x)/(13+x) equation: 


D( x )

x+13 = 0

x+13 = 0

x+13 = 0

x+13 = 0 // - 13

x = -13

x in (-oo:-13) U (-13:+oo)

23.3 = (30*x+130)/(x+13) // - (30*x+130)/(x+13)

23.3-((30*x+130)/(x+13)) = 0

(-1*(30*x+130))/(x+13)+23.3 = 0

(-1*(30*x+130))/(x+13)+(23.3*(x+13))/(x+13) = 0

23.3*(x+13)-1*(30*x+130) = 0

172.9-6.7*x = 0

(172.9-6.7*x)/(x+13) = 0

(172.9-6.7*x)/(x+13) = 0 // * x+13

172.9-6.7*x = 0

172.9-6.7*x = 0 // - 172.9

-6.7*x = -172.9 // : -6.7

x = -172.9/(-6.7)

x = 25.80597015

x = 25.80597015

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