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x in (-oo:+oo)
(2/5)*x = 22/5 // - 22/5
(2/5)*x-(22/5) = 0
(2/5)*x-22/5 = 0
2/5*x-22/5 = 0 // + 22/5
2/5*x = 22/5 // : 2/5
x = 22/5/2/5
x = 11
x = 11
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