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x in (-oo:+oo)
(1/2)*x-(2/5) = 2/5 // - 2/5
(1/2)*x-(2/5)-(2/5) = 0
(1/2)*x-2/5-2/5 = 0
1/2*x-4/5 = 0 // + 4/5
1/2*x = 4/5 // : 1/2
x = 4/5/1/2
x = 8/5
x = 8/5
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