4/7+a=5/21

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Solution for 4/7+a=5/21 equation: 


a in (-oo:+oo)

a+4/7 = 5/21 // - 5/21

a+4/7-(5/21) = 0

a+4/7-5/21 = 0

a+1/3 = 0 // - 1/3

a = -1/3

a = -1/3

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