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(1/4)*x-9 = (1/3)*x-((16/3)*x) // - (1/3)*x-((16/3)*x)
(1/4)*x-((1/3)*x)+(16/3)*x-9 = 0
(1/4)*x+(-1/3)*x+(16/3)*x-9 = 0
21/4*x-9 = 0 // + 9
21/4*x = 9 // : 21/4
x = 9/21/4
x = 12/7
x = 12/7
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