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a in (-oo:+oo)
4*a-(1/7) = 3*a-(1/5) // - 3*a-(1/5)
4*a-(3*a)-(1/7)+1/5 = 0
4*a-3*a-1/7+1/5 = 0
a+2/35 = 0 // - 2/35
a = -2/35
a = -2/35
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