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x in (-oo:+oo)
5/16 = x/12 // - x/12
5/16-(x/12) = 0
5/16-1/12*x = 0 // - 5/16
-1/12*x = -5/16 // : -1/12
x = -5/16/(-1/12)
x = 15/4
x = 15/4
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