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(2/3)*x+9 = 42-(3*x) // - 42-(3*x)
(2/3)*x+3*x-42+9 = 0
11/3*x-33 = 0 // + 33
11/3*x = 33 // : 11/3
x = 33/11/3
x = 9
x = 9
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