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X in (-oo:+oo)
X/12 = 1.2/1.8 // - 1.2/1.8
X/12-(1.2/1.8) = 0
X/12-0.66666667 = 0
1/12*X-0.66666667 = 0 // + 0.66666667
1/12*X = 0.66666667 // : 1/12
X = 0.66666667/1/12
X = 8.00000036
X = 8.00000036
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