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a in (-oo:+oo)
4*a-(3*a)+1 = 13/11 // - 13/11
4*a-(3*a)-(13/11)+1 = 0
4*a-3*a-13/11+1 = 0
a-2/11 = 0 // + 2/11
a = 2/11
a = 2/11
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