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x in (-oo:+oo)
(4/5)*x-(2/5) = 1 // - 1
(4/5)*x-(2/5)-1 = 0
(4/5)*x-2/5-1 = 0
4/5*x-7/5 = 0 // + 7/5
4/5*x = 7/5 // : 4/5
x = 7/5/4/5
x = 7/4
x = 7/4
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