3a/7-9/7-a/7

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


a in (-oo:+oo)

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

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

2/7*a-9/7 = 0 // + 9/7

2/7*a = 9/7 // : 2/7

a = 9/7/2/7

a = 9/2

a = 9/2

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