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x in (-oo:+oo)
(x/2)/3 = 21/8 // - 21/8
(x/2)/3-(21/8) = 0
(x/2)/3-21/8 = 0
1/6*x-21/8 = 0 // + 21/8
1/6*x = 21/8 // : 1/6
x = 21/8/1/6
x = 63/4
x = 63/4
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