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