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a in (-oo:+oo)
6*a+a+7 = 14/3 // - 14/3
6*a+a-(14/3)+7 = 0
6*a+a-14/3+7 = 0
7*a+7/3 = 0 // - 7/3
7*a = -7/3 // : 7
a = -7/3/7
a = -1/3
a = -1/3
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