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x in (-oo:+oo)
6/12 = x/42 // - x/42
6/12-(x/42) = 0
1/2-1/42*x = 0 // - 1/2
-1/42*x = -1/2 // : -1/42
x = -1/2/(-1/42)
x = 21
x = 21
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