(11+x)/(15+x)=0.8571

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Solution for (11+x)/(15+x)=0.8571 equation: 


D( x )

x+15 = 0

x+15 = 0

x+15 = 0

x+15 = 0 // - 15

x = -15

x in (-oo:-15) U (-15:+oo)

(x+11)/(x+15) = 0.8571 // - 0.8571

(x+11)/(x+15)-0.8571 = 0

(x+11)/(x+15)+(-0.8571*(x+15))/(x+15) = 0

x-0.8571*(x+15)+11 = 0

0.1429*x-1.8565 = 0

(0.1429*x-1.8565)/(x+15) = 0

(0.1429*x-1.8565)/(x+15) = 0 // * x+15

0.1429*x-1.8565 = 0

0.1429*x-1.8565 = 0 // + 1.8565

0.1429*x = 1.8565 // : 0.1429

x = 1.8565/0.1429

x = 12.99160252

x = 12.99160252

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