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x in (-oo:+oo)
(12*x)/6-12 = 1/3 // - 1/3
(12*x)/6-(1/3)-12 = 0
(12*x)/6-1/3-12 = 0
2*x-37/3 = 0 // + 37/3
2*x = 37/3 // : 2
x = 37/3/2
x = 37/6
x = 37/6
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