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