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x in (-oo:+oo)
((11/3)/21)/2 = x/5 // - x/5
((11/3)/21)/2-(x/5) = 0
11/126-1/5*x = 0 // - 11/126
-1/5*x = -11/126 // : -1/5
x = -11/126/(-1/5)
x = 55/126
x = 55/126
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