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