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x in (-oo:+oo)
(25/0.4)*x = 3.125 // - 3.125
(25/0.4)*x-3.125 = 0
62.5*x-3.125 = 0 // + 3.125
62.5*x = 3.125 // : 62.5
x = 3.125/62.5
x = 0.05
x = 0.05
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