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a in (-oo:+oo)
-4*a-1 = 6*a-6 // - 6*a-6
6-4*a-(6*a)-1 = 0
6-4*a-6*a-1 = 0
5-10*a = 0 // - 5
-10*a = -5 // : -10
a = -5/(-10)
a = 1/2
a = 1/2
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