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x in (-oo:+oo)
(4/5)*x-(4/5) = 3 // - 3
(4/5)*x-(4/5)-3 = 0
(4/5)*x-4/5-3 = 0
4/5*x-19/5 = 0 // + 19/5
4/5*x = 19/5 // : 4/5
x = 19/5/4/5
x = 19/4
x = 19/4
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