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(2/3)*x+6 = 16/3 // - 16/3
(2/3)*x-(16/3)+6 = 0
(2/3)*x-16/3+6 = 0
2/3*x+2/3 = 0 // - 2/3
2/3*x = -2/3 // : 2/3
x = -2/3/2/3
x = -1
x = -1
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