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X/3+(2*x)/9+(7*x)/27 = x // - x
X/3+(2*x)/9+(7*x)/27-x = 0
1/3*X-14/27*x = 0 // - 1/3*X
-14/27*x = -(1/3*X) // : -14/27
x = (-(1/3*X))/(-14/27)
x = 9/14*X
x = 9/14*X
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