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x in (-oo:+oo)
7/2 = x/16 // - x/16
7/2-(x/16) = 0
7/2-1/16*x = 0 // - 7/2
-1/16*x = -7/2 // : -1/16
x = -7/2/(-1/16)
x = 56
x = 56
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