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x in (-oo:+oo)
3/5 = x/40 // - x/40
3/5-(x/40) = 0
3/5-1/40*x = 0 // - 3/5
-1/40*x = -3/5 // : -1/40
x = -3/5/(-1/40)
x = 24
x = 24
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