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a in (-oo:+oo)
a/7 = a-(4/3) // - a-(4/3)
a/7-a+4/3 = 0
4/3-6/7*a = 0 // - 4/3
-6/7*a = -4/3 // : -6/7
a = -4/3/(-6/7)
a = 14/9
a = 14/9
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