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x in (-oo:+oo)
7/12-(1/2) = x-(7/6) // - x-(7/6)
7/12-x-(1/2)+7/6 = 0
7/12-x-1/2+7/6 = 0
5/4-x = 0 // - 5/4
-x = -5/4 // * -1
x = 5/4
x = 5/4
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