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x in (-oo:+oo)
14*x = 2/5 // - 2/5
14*x-(2/5) = 0
14*x-2/5 = 0
14*x-2/5 = 0 // + 2/5
14*x = 2/5 // : 14
x = 2/5/14
x = 1/35
x = 1/35
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