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x in (-oo:+oo)
6/5 = x/20 // - x/20
6/5-(x/20) = 0
6/5-1/20*x = 0 // - 6/5
-1/20*x = -6/5 // : -1/20
x = -6/5/(-1/20)
x = 24
x = 24
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