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(2/5)*x+2/5 = 5/6 // - 5/6
(2/5)*x+2/5-(5/6) = 0
(2/5)*x+2/5-5/6 = 0
2/5*x-13/30 = 0 // + 13/30
2/5*x = 13/30 // : 2/5
x = 13/30/2/5
x = 13/12
x = 13/12
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