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x in (-oo:+oo)
8 = (12*x)/3 // - (12*x)/3
8-((12*x)/3) = 0
8-4*x = 0
8-4*x = 0 // - 8
-4*x = -8 // : -4
x = -8/(-4)
x = 2
x = 2
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