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x in (-oo:+oo)
(2/5)*x = 3/30 // - 3/30
(2/5)*x-(3/30) = 0
(2/5)*x-1/10 = 0
2/5*x-1/10 = 0 // + 1/10
2/5*x = 1/10 // : 2/5
x = 1/10/2/5
x = 1/4
x = 1/4
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