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-2/11 = (2*x)/13 // - (2*x)/13
-((2*x)/13)-2/11 = 0
(-2/13)*x-2/11 = 0
-2/13*x-2/11 = 0 // + 2/11
-2/13*x = 2/11 // : -2/13
x = 2/11/(-2/13)
x = -13/11
x = -13/11
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