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x in (-oo:+oo)
x/8 = 21/24 // - 21/24
x/8-(21/24) = 0
x/8-7/8 = 0
1/8*x-7/8 = 0 // + 7/8
1/8*x = 7/8 // : 1/8
x = 7/8/1/8
x = 7
x = 7
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