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