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X-((1/3)*X)-((2*x)/5) = 0
X+(-1/3)*X+(-2/5)*x = 0
2/3*X-2/5*x = 0 // - 2/3*X
-2/5*x = -(2/3*X) // : -2/5
x = (-(2/3*X))/(-2/5)
x = 5/3*X
x = 5/3*X
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