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X/3-((7*x)/13) = 0
X/3+(-7/13)*x = 0
1/3*X-7/13*x = 0 // - 1/3*X
-7/13*x = -(1/3*X) // : -7/13
x = (-(1/3*X))/(-7/13)
x = 13/21*X
x = 13/21*X
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