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