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x in (-oo:+oo)
3*x = 7/2 // - 7/2
3*x-(7/2) = 0
3*x-7/2 = 0
3*x-7/2 = 0 // + 7/2
3*x = 7/2 // : 3
x = 7/2/3
x = 7/6
x = 7/6
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