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a in (-oo:+oo)
4*a = 140/29 // - 140/29
4*a-(140/29) = 0
4*a-140/29 = 0
4*a-140/29 = 0 // + 140/29
4*a = 140/29 // : 4
a = 140/29/4
a = 35/29
a = 35/29
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