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x in (-oo:+oo)
x/12+12/4 = x/3 // - x/3
x/12-(x/3)+12/4 = 0
3-1/4*x = 0 // - 3
-1/4*x = -3 // : -1/4
x = -3/(-1/4)
x = 12
x = 12
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