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x in (-oo:+oo)
(4/5)*x-(1/4) = 6/20 // - 6/20
(4/5)*x-(1/4)-(6/20) = 0
(4/5)*x-1/4-3/10 = 0
4/5*x-11/20 = 0 // + 11/20
4/5*x = 11/20 // : 4/5
x = 11/20/4/5
x = 11/16
x = 11/16
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