20a/(28-x)=2a/8

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Solution for 20a/(28-x)=2a/8 equation: 


D( x )

28-x = 0

28-x = 0

28-x = 0

28-x = 0 // - 28

-x = -28 // * -1

x = 28

x in (-oo:28) U (28:+oo)

(20*a)/(28-x) = (2*a)/8 // - (2*a)/8

(20*a)/(28-x)-((2*a)/8) = 0

(20*a)/(28-x)+(-1/4)*a = 0

(20*a)/(28-x)-a/4 = 0

(4*20*a)/(4*(28-x))+(-a*(28-x))/(4*(28-x)) = 0

4*20*a-a*(28-x) = 0

a*x+52*a = 0

(a*x+52*a)/(4*(28-x)) = 0

(a*x+52*a)/(4*(28-x)) = 0 // * 4*(28-x)

a*x+52*a = 0

a*x+52*a = 0 // - 52*a

a*x = -(52*a) // : a

x = (-(52*a))/a

x = -52

x = -52

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