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x in (-oo:+oo)
7/12 = x/18 // - x/18
7/12-(x/18) = 0
7/12-1/18*x = 0 // - 7/12
-1/18*x = -7/12 // : -1/18
x = -7/12/(-1/18)
x = 21/2
x = 21/2
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