-1/3-5/7a+1/4a=-257/420

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Solution for -1/3-5/7a+1/4a=-257/420 equation: 


a in (-oo:+oo)

(1/4)*a-((5/7)*a)-1/3 = -257/420 // + -257/420

(1/4)*a-((5/7)*a)-1/3-(-257/420) = 0

(-5/7)*a+(1/4)*a-1/3+257/420 = 0

39/140-13/28*a = 0 // - 39/140

-13/28*a = -39/140 // : -13/28

a = -39/140/(-13/28)

a = 3/5

a = 3/5

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