10/21=5/7a

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Solution for 10/21=5/7a equation: 


a in (-oo:+oo)

10/21 = (5/7)*a // - (5/7)*a

10/21-((5/7)*a) = 0

(-5/7)*a+10/21 = 0

10/21-5/7*a = 0 // - 10/21

-5/7*a = -10/21 // : -5/7

a = -10/21/(-5/7)

a = 2/3

a = 2/3

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