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(12/7)*x-((1/3)*x) = 3 // - 3
(12/7)*x-((1/3)*x)-3 = 0
(12/7)*x+(-1/3)*x-3 = 0
29/21*x-3 = 0 // + 3
29/21*x = 3 // : 29/21
x = 3/29/21
x = 63/29
x = 63/29
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