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(2/5)*x-(1/3) = 3 // - 3
(2/5)*x-(1/3)-3 = 0
(2/5)*x-1/3-3 = 0
2/5*x-10/3 = 0 // + 10/3
2/5*x = 10/3 // : 2/5
x = 10/3/2/5
x = 25/3
x = 25/3
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