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(1/3)*x+5 = 20/3 // - 20/3
(1/3)*x-(20/3)+5 = 0
(1/3)*x-20/3+5 = 0
1/3*x-5/3 = 0 // + 5/3
1/3*x = 5/3 // : 1/3
x = 5/3/1/3
x = 5
x = 5
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