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a in (-oo:+oo)
a/7-a-(5/2) = 3 // - 3
a/7-a-(5/2)-3 = 0
a/7-a-5/2-3 = 0
-6/7*a-11/2 = 0 // + 11/2
-6/7*a = 11/2 // : -6/7
a = 11/2/(-6/7)
a = -77/12
a = -77/12
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