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