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x in (-oo:+oo)
10/20 = x/5 // - x/5
10/20-(x/5) = 0
1/2-1/5*x = 0 // - 1/2
-1/5*x = -1/2 // : -1/5
x = -1/2/(-1/5)
x = 5/2
x = 5/2
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