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