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a in (-oo:+oo)
2 = 4*a-a+5 // - 4*a-a+5
a-(4*a)-5+2 = 0
a-4*a-5+2 = 0
-3*a-3 = 0 // + 3
-3*a = 3 // : -3
a = 3/(-3)
a = -1
a = -1
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