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x in (-oo:+oo)
21/2 = x/16 // - x/16
21/2-(x/16) = 0
21/2-1/16*x = 0 // - 21/2
-1/16*x = -21/2 // : -1/16
x = -21/2/(-1/16)
x = 168
x = 168
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