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x in (-oo:+oo)
24/42 = x/14 // - x/14
24/42-(x/14) = 0
4/7-1/14*x = 0 // - 4/7
-1/14*x = -4/7 // : -1/14
x = -4/7/(-1/14)
x = 8
x = 8
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