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