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x in (-oo:+oo)
(2/5)*x-(1/4) = 3/10 // - 3/10
(2/5)*x-(1/4)-(3/10) = 0
(2/5)*x-1/4-3/10 = 0
2/5*x-11/20 = 0 // + 11/20
2/5*x = 11/20 // : 2/5
x = 11/20/2/5
x = 11/8
x = 11/8
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