0.95=(18+x)/(20+x)

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Solution for 0.95=(18+x)/(20+x) equation: 


D( x )

x+20 = 0

x+20 = 0

x+20 = 0

x+20 = 0 // - 20

x = -20

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

0.95 = (x+18)/(x+20) // - (x+18)/(x+20)

0.95-((x+18)/(x+20)) = 0

(-1*(x+18))/(x+20)+0.95 = 0

(-1*(x+18))/(x+20)+(0.95*(x+20))/(x+20) = 0

0.95*(x+20)-1*(x+18) = 0

1-0.05*x = 0

(1-0.05*x)/(x+20) = 0

(1-0.05*x)/(x+20) = 0 // * x+20

1-0.05*x = 0

1-0.05*x = 0 // - 1

-0.05*x = -1 // : -0.05

x = -1/(-0.05)

x = 20

x = 20

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