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x in (-oo:+oo)
4/3 = x/12 // - x/12
4/3-(x/12) = 0
4/3-1/12*x = 0 // - 4/3
-1/12*x = -4/3 // : -1/12
x = -4/3/(-1/12)
x = 16
x = 16
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