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x in (-oo:+oo)
5*x = 7/5 // - 7/5
5*x-(7/5) = 0
5*x-7/5 = 0
5*x-7/5 = 0 // + 7/5
5*x = 7/5 // : 5
x = 7/5/5
x = 7/25
x = 7/25
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