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a in (-oo:+oo)
4*a-(1/7) = 5/7 // - 5/7
4*a-(1/7)-(5/7) = 0
4*a-1/7-5/7 = 0
4*a-6/7 = 0 // + 6/7
4*a = 6/7 // : 4
a = 6/7/4
a = 3/14
a = 3/14
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