(15+x)/(15+5+x)=0,9

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Solution for (15+x)/(15+5+x)=0,9 equation: 


D( x )

x+5+15 = 0

x+5+15 = 0

x+5+15 = 0

x+20 = 0 // - 20

x = -20

x in (-oo:-20) U (-20:+oo)

(x+15)/(x+5+15) = 0.9 // - 0.9

(x+15)/(x+5+15)-0.9 = 0

(x+15)/(x+20)-0.9 = 0

(x+15)/(x+20)+(-0.9*(x+20))/(x+20) = 0

x-0.9*(x+20)+15 = 0

0.1*x-3 = 0

(0.1*x-3)/(x+20) = 0

(0.1*x-3)/(x+20) = 0 // * x+20

0.1*x-3 = 0

0.1*x-3 = 0 // + 3

0.1*x = 3 // : 0.1

x = 3/0.1

x = 30

x = 30

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