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