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a in (-oo:+oo)
7-6*a = 5*a+3/2 // - 5*a+3/2
7-6*a-(5*a)-(3/2) = 0
7-6*a-5*a-3/2 = 0
11/2-11*a = 0 // - 11/2
-11*a = -11/2 // : -11
a = -11/2/(-11)
a = 1/2
a = 1/2
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