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(4/3)*x-6 = 12-((5/3)*x) // - 12-((5/3)*x)
(4/3)*x+(5/3)*x-12-6 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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