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x in (-oo:+oo)
3*x = 4/5 // - 4/5
3*x-(4/5) = 0
3*x-4/5 = 0
3*x-4/5 = 0 // + 4/5
3*x = 4/5 // : 3
x = 4/5/3
x = 4/15
x = 4/15
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