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x in (-oo:+oo)
(2/5)*x-2 = 4/5 // - 4/5
(2/5)*x-(4/5)-2 = 0
(2/5)*x-4/5-2 = 0
2/5*x-14/5 = 0 // + 14/5
2/5*x = 14/5 // : 2/5
x = 14/5/2/5
x = 7
x = 7
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