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x in (-oo:+oo)
x/4-(x/5)-(x/10) = 2 // - 2
x/4-(x/5)-(x/10)-2 = 0
-1/20*x-2 = 0 // + 2
-1/20*x = 2 // : -1/20
x = 2/(-1/20)
x = -40
x = -40
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