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a in (-oo:+oo)
(7/15)*a = 1/6 // - 1/6
(7/15)*a-(1/6) = 0
(7/15)*a-1/6 = 0
7/15*a-1/6 = 0 // + 1/6
7/15*a = 1/6 // : 7/15
a = 1/6/7/15
a = 5/14
a = 5/14
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