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a in (-oo:+oo)
6 = 4*a-a+3 // - 4*a-a+3
a-(4*a)-3+6 = 0
a-4*a-3+6 = 0
3-3*a = 0 // - 3
-3*a = -3 // : -3
a = -3/(-3)
a = 1
a = 1
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