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x in (-oo:+oo)
(2/5)*x = 9-5 // - 9-5
(2/5)*x-9+5 = 0
2/5*x-4 = 0 // + 4
2/5*x = 4 // : 2/5
x = 4/2/5
x = 10
x = 10
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