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x in (-oo:+oo)
56/84 = x/12 // - x/12
56/84-(x/12) = 0
2/3-1/12*x = 0 // - 2/3
-1/12*x = -2/3 // : -1/12
x = -2/3/(-1/12)
x = 8
x = 8
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