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x in (-oo:+oo)
18/12 = x/4 // - x/4
18/12-(x/4) = 0
3/2-1/4*x = 0 // - 3/2
-1/4*x = -3/2 // : -1/4
x = -3/2/(-1/4)
x = 6
x = 6
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