1/4(4-k)=2/5

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Solution for 1/4(4-k)=2/5 equation: 


k in (-oo:+oo)

(1/4)*(4-k) = 2/5 // - 2/5

(1/4)*(4-k)-(2/5) = 0

(1/4)*(4-k)-2/5 = 0

1/4*(4-k)-2/5 = 0

(1/4*5*(4-k))/5-2/5 = 0

1/4*5*(4-k)-2 = 0

3-5/4*k = 0

(3-5/4*k)/5 = 0

(3-5/4*k)/5 = 0 // * 5

3-5/4*k = 0

3-5/4*k = 0 // - 3

-5/4*k = -3 // : -5/4

k = -3/(-5/4)

k = 12/5

k = 12/5

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