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(2/5)*x-(1/3) = 4 // - 4
(2/5)*x-(1/3)-4 = 0
(2/5)*x-1/3-4 = 0
2/5*x-13/3 = 0 // + 13/3
2/5*x = 13/3 // : 2/5
x = 13/3/2/5
x = 65/6
x = 65/6
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