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x in (-oo:+oo)
28/196 = x/91 // - x/91
28/196-(x/91) = 0
1/7-1/91*x = 0 // - 1/7
-1/91*x = -1/7 // : -1/91
x = -1/7/(-1/91)
x = 13
x = 13
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