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