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18 = (1200-(2*x))/49 // - (1200-(2*x))/49
18-((1200-(2*x))/49) = 0
18-((1200-2*x)/49) = 0
(-1*(1200-2*x))/49+18 = 0
(-1*(1200-2*x))/49+(18*49)/49 = 0
18*49-1*(1200-2*x) = 0
2*x-318 = 0
(2*x-318)/49 = 0
(2*x-318)/49 = 0 // * 49
2*x-318 = 0
2*x-318 = 0 // + 318
2*x = 318 // : 2
x = 318/2
x = 159
x = 159
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