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x in (-oo:+oo)
x = 2/X+3*x+4 // - 2/X+3*x+4
x-(2/X)-(3*x)-4 = 0
x-2*X^-1-3*x-4 = 0
-2*X^-1-2*x-4 = 0 // + -2*X^-1-4
-2*x = -(-2*X^-1-4) // : -2
x = (-(-2*X^-1-4))/(-2)
x = (4-(-2*X^-1))/(-2)
x = (4-(-2*X^-1))/(-2)
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