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x in (-oo:+oo)
(2/5)*x-(4/5) = 1/2 // - 1/2
(2/5)*x-(4/5)-(1/2) = 0
(2/5)*x-4/5-1/2 = 0
2/5*x-13/10 = 0 // + 13/10
2/5*x = 13/10 // : 2/5
x = 13/10/2/5
x = 13/4
x = 13/4
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