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a in (-oo:+oo)
1-(6*a) = 13-4*a // - 13-4*a
1-(6*a)-(-4*a)-13 = 0
4*a-6*a-13+1 = 0
-2*a-12 = 0 // + 12
-2*a = 12 // : -2
a = 12/(-2)
a = -6
a = -6
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