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x in (-oo:+oo)
9/12 = x/48 // - x/48
9/12-(x/48) = 0
3/4-1/48*x = 0 // - 3/4
-1/48*x = -3/4 // : -1/48
x = -3/4/(-1/48)
x = 36
x = 36
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