4/5+1/3k-3/4k=311/420

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Solution for 4/5+1/3k-3/4k=311/420 equation: 


k in (-oo:+oo)

(1/3)*k-((3/4)*k)+4/5 = 311/420 // - 311/420

(1/3)*k-((3/4)*k)+4/5-(311/420) = 0

(1/3)*k+(-3/4)*k+4/5-311/420 = 0

5/84-5/12*k = 0 // - 5/84

-5/12*k = -5/84 // : -5/12

k = -5/84/(-5/12)

k = 1/7

k = 1/7

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