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a in (-oo:+oo)
(6/7)*a-2 = 16/7 // - 16/7
(6/7)*a-(16/7)-2 = 0
(6/7)*a-16/7-2 = 0
6/7*a-30/7 = 0 // + 30/7
6/7*a = 30/7 // : 6/7
a = 30/7/6/7
a = 5
a = 5
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