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(31/3)*x = 91/3 // - 91/3
(31/3)*x-(91/3) = 0
(31/3)*x-91/3 = 0
31/3*x-91/3 = 0 // + 91/3
31/3*x = 91/3 // : 31/3
x = 91/3/31/3
x = 91/31
x = 91/31
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