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X in (-oo:+oo)
X/12 = 3.5 // - 3.5
X/12-3.5 = 0
1/12*X-3.5 = 0 // + 3.5
1/12*X = 3.5 // : 1/12
X = 3.5/1/12
X = 42.00000168
X = 42.00000168
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