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X in (-oo:+oo)
(X-4)/2+(X+9)/3 = 5/2 // - 5/2
(X-4)/2+(X+9)/3-(5/2) = 0
(X-4)/2+(X+9)/3-5/2 = 0
(3*(X-4))/(2*3)+(2*(X+9))/(2*3)+(-5*3)/(2*3) = 0
3*(X-4)+2*(X+9)-5*3 = 0
5*X-15+6 = 0
5*X-9 = 0
(5*X-9)/(2*3) = 0
(5*X-9)/(2*3) = 0 // * 2*3
5*X-9 = 0
5*X-9 = 0 // + 9
5*X = 9 // : 5
X = 9/5
X = 9/5
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