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x in (-oo:+oo)
x/12 = 2.4 // - 2.4
x/12-2.4 = 0
1/12*x-2.4 = 0 // + 2.4
1/12*x = 2.4 // : 1/12
x = 2.4/1/12
x = 28.80000115
x = 28.80000115
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