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x in (-oo:+oo)
26/86 = x/100 // - x/100
26/86-(x/100) = 0
13/43-1/100*x = 0 // - 13/43
-1/100*x = -13/43 // : -1/100
x = -13/43/(-1/100)
x = 1300/43
x = 1300/43
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