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x in (-oo:+oo)
8/21 = x/2 // - x/2
8/21-(x/2) = 0
8/21-1/2*x = 0 // - 8/21
-1/2*x = -8/21 // : -1/2
x = -8/21/(-1/2)
x = 16/21
x = 16/21
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