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2/3 = (8/13)*x+4/13 // - (8/13)*x+4/13
2/3-((8/13)*x)-(4/13) = 0
(-8/13)*x+2/3-4/13 = 0
14/39-8/13*x = 0 // - 14/39
-8/13*x = -14/39 // : -8/13
x = -14/39/(-8/13)
x = 7/12
x = 7/12
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