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