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x in (-oo:+oo)
(5/2)*x+2*x = 3/2 // - 3/2
(5/2)*x+2*x-(3/2) = 0
(5/2)*x+2*x-3/2 = 0
9/2*x-3/2 = 0 // + 3/2
9/2*x = 3/2 // : 9/2
x = 3/2/9/2
x = 1/3
x = 1/3
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