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x in (-oo:+oo)
3 = x/4-(x/5) // - x/4-(x/5)
x/5-(x/4)+3 = 0
3-1/20*x = 0 // - 3
-1/20*x = -3 // : -1/20
x = -3/(-1/20)
x = 60
x = 60
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