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(1/18)*x-18 = (1/28)*x-16 // - (1/28)*x-16
(1/18)*x-((1/28)*x)-18+16 = 0
(1/18)*x+(-1/28)*x-18+16 = 0
5/252*x-2 = 0 // + 2
5/252*x = 2 // : 5/252
x = 2/5/252
x = 504/5
x = 504/5
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