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(4/3)*x = 2/5 // - 2/5
(4/3)*x-(2/5) = 0
(4/3)*x-2/5 = 0
4/3*x-2/5 = 0 // + 2/5
4/3*x = 2/5 // : 4/3
x = 2/5/4/3
x = 3/10
x = 3/10
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