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x in (-oo:+oo)
1/4-(2/5) = x/20 // - x/20
1/4-(x/20)-(2/5) = 0
1/4-(x/20)-2/5 = 0
-1/20*x-3/20 = 0 // + 3/20
-1/20*x = 3/20 // : -1/20
x = 3/20/(-1/20)
x = -3
x = -3
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