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a in (-oo:+oo)
4*a+1/7 = 3*a-(4/3) // - 3*a-(4/3)
4*a-(3*a)+1/7+4/3 = 0
4*a-3*a+1/7+4/3 = 0
a+31/21 = 0 // - 31/21
a = -31/21
a = -31/21
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