x/(4x+5)=4

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Solution for x/(4x+5)=4 equation: 


D( x )

4*x+5 = 0

4*x+5 = 0

4*x+5 = 0

4*x+5 = 0 // - 5

4*x = -5 // : 4

x = -5/4

x in (-oo:-5/4) U (-5/4:+oo)

x/(4*x+5) = 4 // - 4

x/(4*x+5)-4 = 0

x/(4*x+5)+(-4*(4*x+5))/(4*x+5) = 0

x-4*(4*x+5) = 0

-15*x-20 = 0

(-15*x-20)/(4*x+5) = 0

(-15*x-20)/(4*x+5) = 0 // * 4*x+5

-15*x-20 = 0

-15*x-20 = 0 // + 20

-15*x = 20 // : -15

x = 20/(-15)

x = -4/3

x = -4/3

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