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x in (-oo:+oo)
X/3 = (4*x)/9 // - (4*x)/9
X/3-((4*x)/9) = 0
X/3+(-4/9)*x = 0
1/3*X-4/9*x = 0 // - 1/3*X
-4/9*x = -(1/3*X) // : -4/9
x = (-(1/3*X))/(-4/9)
x = 3/4*X
x = 3/4*X
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