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(2/3)*x-4 = 1/5 // - 1/5
(2/3)*x-(1/5)-4 = 0
(2/3)*x-1/5-4 = 0
2/3*x-21/5 = 0 // + 21/5
2/3*x = 21/5 // : 2/3
x = 21/5/2/3
x = 63/10
x = 63/10
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