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x in (-oo:+oo)
5/8 = x/40 // - x/40
5/8-(x/40) = 0
5/8-1/40*x = 0 // - 5/8
-1/40*x = -5/8 // : -1/40
x = -5/8/(-1/40)
x = 25
x = 25
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