9/7a-1/3a

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Solution for 9/7a-1/3a equation: 


a in (-oo:+oo)

(9/7)*a-((1/3)*a) = 0

(9/7)*a+(-1/3)*a = 0

20/21*a = 0 // : 20/21

a = 0

a = 0

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