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x in (-oo:+oo)
3*x = 16/15 // - 16/15
3*x-(16/15) = 0
3*x-16/15 = 0
3*x-16/15 = 0 // + 16/15
3*x = 16/15 // : 3
x = 16/15/3
x = 16/45
x = 16/45
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