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4/12 = x+(2/2)*x+13 // - x+(2/2)*x+13
4/12-x-((2/2)*x)-13 = 0
4/12-x-x-13 = 0
-2*x-38/3 = 0 // + 38/3
-2*x = 38/3 // : -2
x = 38/3/(-2)
x = -19/3
x = -19/3
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