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x in (-oo:+oo)
(2/5)*x = 2.5 // - 2.5
(2/5)*x-2.5 = 0
2/5*x-2.5 = 0 // + 2.5
2/5*x = 2.5 // : 2/5
x = 2.5/2/5
x = 6.25
x = 6.25
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