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x in (-oo:+oo)
84/98 = x/7 // - x/7
84/98-(x/7) = 0
6/7-1/7*x = 0 // - 6/7
-1/7*x = -6/7 // : -1/7
x = -6/7/(-1/7)
x = 6
x = 6
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