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(3/13)*x-((1/3)*x) = 4/9+1 // - 4/9+1
(3/13)*x-((1/3)*x)-(4/9)-1 = 0
(3/13)*x+(-1/3)*x-4/9-1 = 0
-4/39*x-13/9 = 0 // + 13/9
-4/39*x = 13/9 // : -4/39
x = 13/9/(-4/39)
x = -169/12
x = -169/12
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