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a in (-oo:+oo)
2*a = 14/5 // - 14/5
2*a-(14/5) = 0
2*a-14/5 = 0
2*a-14/5 = 0 // + 14/5
2*a = 14/5 // : 2
a = 14/5/2
a = 7/5
a = 7/5
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