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x in (-oo:+oo)
268/28 = x/21 // - x/21
268/28-(x/21) = 0
67/7-1/21*x = 0 // - 67/7
-1/21*x = -67/7 // : -1/21
x = -67/7/(-1/21)
x = 201
x = 201
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