(3-x)/20=2/5

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Solution for (3-x)/20=2/5 equation: 


x in (-oo:+oo)

(3-x)/20 = 2/5 // - 2/5

(3-x)/20-(2/5) = 0

(3-x)/20-2/5 = 0

(5*(3-x))/(5*20)+(-2*20)/(5*20) = 0

5*(3-x)-2*20 = 0

-5*x-25 = 0

(-5*x-25)/(5*20) = 0

(-5*x-25)/(5*20) = 0 // * 5*20

-5*x-25 = 0

-5*x-25 = 0 // + 25

-5*x = 25 // : -5

x = 25/(-5)

x = -5

x = -5

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