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a in (-oo:+oo)
7 = 5*a-(6/2) // - 5*a-(6/2)
6/2-(5*a)+7 = 0
6/2-5*a+7 = 0
10-5*a = 0 // - 10
-5*a = -10 // : -5
a = -10/(-5)
a = 2
a = 2
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