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x in (-oo:+oo)
1/4-(x/5) = 11/20 // - 11/20
1/4-(x/5)-(11/20) = 0
1/4-(x/5)-11/20 = 0
-1/5*x-3/10 = 0 // + 3/10
-1/5*x = 3/10 // : -1/5
x = 3/10/(-1/5)
x = -3/2
x = -3/2
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