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x in (-oo:+oo)
(x/2)/3 = 21/16 // - 21/16
(x/2)/3-(21/16) = 0
(x/2)/3-21/16 = 0
1/6*x-21/16 = 0 // + 21/16
1/6*x = 21/16 // : 1/6
x = 21/16/1/6
x = 63/8
x = 63/8
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