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x_15 in (-oo:+oo)
3*x_15 = 1/2 // - 1/2
3*x_15-(1/2) = 0
3*x_15-1/2 = 0
3*x_15-1/2 = 0 // + 1/2
3*x_15 = 1/2 // : 3
x_15 = 1/2/3
x_15 = 1/6
x_15 = 1/6
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