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x in (-oo:+oo)
(2/5)*x = 13/4 // - 13/4
(2/5)*x-(13/4) = 0
(2/5)*x-13/4 = 0
2/5*x-13/4 = 0 // + 13/4
2/5*x = 13/4 // : 2/5
x = 13/4/2/5
x = 65/8
x = 65/8
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