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x in (-oo:+oo)
3*x = 381/4 // - 381/4
3*x-(381/4) = 0
3*x-381/4 = 0
3*x-381/4 = 0 // + 381/4
3*x = 381/4 // : 3
x = 381/4/3
x = 127/4
x = 127/4
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