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