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a in (-oo:+oo)
-1 = 1-3*a-a // - 1-3*a-a
a-(-3*a)-1-1 = 0
3*a+a-1-1 = 0
4*a-2 = 0 // + 2
4*a = 2 // : 4
a = 2/4
a = 1/2
a = 1/2
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