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x in (-oo:+oo)
(2/5)*x = 3/4 // - 3/4
(2/5)*x-(3/4) = 0
(2/5)*x-3/4 = 0
2/5*x-3/4 = 0 // + 3/4
2/5*x = 3/4 // : 2/5
x = 3/4/2/5
x = 15/8
x = 15/8
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