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x in (-oo:+oo)
3/12 = x/56 // - x/56
3/12-(x/56) = 0
1/4-1/56*x = 0 // - 1/4
-1/56*x = -1/4 // : -1/56
x = -1/4/(-1/56)
x = 14
x = 14
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