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