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19*x-(18*x)-(9/13) = 15/3+4/13 // - 15/3+4/13
19*x-(18*x)-(9/13)-(15/3)-(4/13) = 0
19*x-18*x-9/13-4/13-5 = 0
x-6 = 0 // + 6
x = 6
x = 6
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