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(1/3)*x = 31/9 // - 31/9
(1/3)*x-(31/9) = 0
(1/3)*x-31/9 = 0
1/3*x-31/9 = 0 // + 31/9
1/3*x = 31/9 // : 1/3
x = 31/9/1/3
x = 31/3
x = 31/3
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