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x in (-oo:+oo)
(2/5)*x-(1/2) = 5 // - 5
(2/5)*x-(1/2)-5 = 0
(2/5)*x-1/2-5 = 0
2/5*x-11/2 = 0 // + 11/2
2/5*x = 11/2 // : 2/5
x = 11/2/2/5
x = 55/4
x = 55/4
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