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(2/3)*x-(1/2) = 4/5 // - 4/5
(2/3)*x-(1/2)-(4/5) = 0
(2/3)*x-1/2-4/5 = 0
2/3*x-13/10 = 0 // + 13/10
2/3*x = 13/10 // : 2/3
x = 13/10/2/3
x = 39/20
x = 39/20
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