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x in (-oo:+oo)
5/25 = x/20 // - x/20
5/25-(x/20) = 0
1/5-1/20*x = 0 // - 1/5
-1/20*x = -1/5 // : -1/20
x = -1/5/(-1/20)
x = 4
x = 4
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