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x in (-oo:+oo)
6*x = 1/216 // - 1/216
6*x-(1/216) = 0
6*x-1/216 = 0
6*x-1/216 = 0 // + 1/216
6*x = 1/216 // : 6
x = 1/216/6
x = 1/1296
x = 1/1296
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