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x in (-oo:+oo)
9/12 = x/24 // - x/24
9/12-(x/24) = 0
3/4-1/24*x = 0 // - 3/4
-1/24*x = -3/4 // : -1/24
x = -3/4/(-1/24)
x = 18
x = 18
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