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(2/3)*x+5 = 77/15 // - 77/15
(2/3)*x-(77/15)+5 = 0
(2/3)*x-77/15+5 = 0
2/3*x-2/15 = 0 // + 2/15
2/3*x = 2/15 // : 2/3
x = 2/15/2/3
x = 1/5
x = 1/5
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