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x in (-oo:+oo)
(2*x)/25 = 0.15/0.4 // - 0.15/0.4
(2*x)/25-(0.15/0.4) = 0
(2*x)/25-0.375 = 0
2/25*x-0.375 = 0 // + 0.375
2/25*x = 0.375 // : 2/25
x = 0.375/2/25
x = 4.6875
x = 4.6875
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