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x in (-oo:+oo)
9/2 = x/12 // - x/12
9/2-(x/12) = 0
9/2-1/12*x = 0 // - 9/2
-1/12*x = -9/2 // : -1/12
x = -9/2/(-1/12)
x = 54
x = 54
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