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x in (-oo:+oo)
3*x = 9/15 // - 9/15
3*x-(9/15) = 0
3*x-3/5 = 0
3*x-3/5 = 0 // + 3/5
3*x = 3/5 // : 3
x = 3/5/3
x = 1/5
x = 1/5
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