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(4/11)*x+(2/11)*x-9 = 18-((3/11)*x) // - 18-((3/11)*x)
(4/11)*x+(2/11)*x+(3/11)*x-18-9 = 0
9/11*x-27 = 0 // + 27
9/11*x = 27 // : 9/11
x = 27/9/11
x = 33
x = 33
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