0.2=4/(15+4+x)

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Solution for 0.2=4/(15+4+x) equation: 


D( x )

x+4+15 = 0

x+4+15 = 0

x+4+15 = 0

x+19 = 0 // - 19

x = -19

x in (-oo:-19) U (-19:+oo)

0.2 = 4/(x+4+15) // - 4/(x+4+15)

0.2-(4/(x+4+15)) = 0

0.2-4*(x+4+15)^-1 = 0

0.2-4/(x+19) = 0

(0.2*(x+19))/(x+19)-4/(x+19) = 0

0.2*(x+19)-4 = 0

0.2*x-0.2 = 0

(0.2*x-0.2)/(x+19) = 0

(0.2*x-0.2)/(x+19) = 0 // * x+19

0.2*x-0.2 = 0

0.2*x-0.2 = 0 // + 0.2

0.2*x = 0.2 // : 0.2

x = 0.2/0.2

x = 1

x = 1

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