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x in (-oo:+oo)
6/20 = x/2 // - x/2
6/20-(x/2) = 0
3/10-1/2*x = 0 // - 3/10
-1/2*x = -3/10 // : -1/2
x = -3/10/(-1/2)
x = 3/5
x = 3/5
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