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x in (-oo:+oo)
3/4 = x/14 // - x/14
3/4-(x/14) = 0
3/4-1/14*x = 0 // - 3/4
-1/14*x = -3/4 // : -1/14
x = -3/4/(-1/14)
x = 21/2
x = 21/2
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