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x in (-oo:+oo)
x-12 = 2*x-(20/6) // - 2*x-(20/6)
x-(2*x)+20/6-12 = 0
x-2*x+20/6-12 = 0
-x-26/3 = 0 // + 26/3
-x = 26/3 // * -1
x = -26/3
x = -26/3
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