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a in (-oo:+oo)
3*a-(1/7) = 6 // - 6
3*a-(1/7)-6 = 0
3*a-1/7-6 = 0
3*a-43/7 = 0 // + 43/7
3*a = 43/7 // : 3
a = 43/7/3
a = 43/21
a = 43/21
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