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