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a in (-oo:+oo)
6*a-(4/7) = 8 // - 8
6*a-(4/7)-8 = 0
6*a-4/7-8 = 0
6*a-60/7 = 0 // + 60/7
6*a = 60/7 // : 6
a = 60/7/6
a = 10/7
a = 10/7
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