21/(4x+1.6)=2.5

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Solution for 21/(4x+1.6)=2.5 equation: 


D( x )

4*x+1.6 = 0

4*x+1.6 = 0

4*x+1.6 = 0

4*x+1.6 = 0 // - 1.6

4*x = -1.6 // : 4

x = -1.6/4

x = -0.4

x in (-oo:-0.4) U (-0.4:+oo)

21/(4*x+1.6) = 2.5 // - 2.5

21/(4*x+1.6)-2.5 = 0

21/(4*x+1.6)+(-2.5*(4*x+1.6))/(4*x+1.6) = 0

21-2.5*(4*x+1.6) = 0

17-10*x = 0

(17-10*x)/(4*x+1.6) = 0

(17-10*x)/(4*x+1.6) = 0 // * 4*x+1.6

17-10*x = 0

17-10*x = 0 // - 17

-10*x = -17 // : -10

x = -17/(-10)

x = 17/10

x = 17/10

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