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x in (-oo:+oo)
7/12 = x/16 // - x/16
7/12-(x/16) = 0
7/12-1/16*x = 0 // - 7/12
-1/16*x = -7/12 // : -1/16
x = -7/12/(-1/16)
x = 28/3
x = 28/3
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