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(4/5)*x = 31/5 // - 31/5
(4/5)*x-(31/5) = 0
(4/5)*x-31/5 = 0
4/5*x-31/5 = 0 // + 31/5
4/5*x = 31/5 // : 4/5
x = 31/5/4/5
x = 31/4
x = 31/4
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