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x in (-oo:+oo)
14/8 = x/12 // - x/12
14/8-(x/12) = 0
7/4-1/12*x = 0 // - 7/4
-1/12*x = -7/4 // : -1/12
x = -7/4/(-1/12)
x = 21
x = 21
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