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x in (-oo:+oo)
3*x = 15/2 // - 15/2
3*x-(15/2) = 0
3*x-15/2 = 0
3*x-15/2 = 0 // + 15/2
3*x = 15/2 // : 3
x = 15/2/3
x = 5/2
x = 5/2
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