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x in (-oo:+oo)
(9/100)*(1600-x)+(27/200)*x = 1872 // - 1872
(9/100)*(1600-x)+(27/200)*x-1872 = 0
9/100*(1600-x)+(27*x)/200-1872 = 0
(9/100*200*(1600-x))/200+(27*x)/200+(-1872*200)/200 = 0
9/100*200*(1600-x)+27*x-1872*200 = 0
9*x-374400+28800 = 0
9*x-345600 = 0
(9*x-345600)/200 = 0
(9*x-345600)/200 = 0 // * 200
9*x-345600 = 0
9*x-345600 = 0 // + 345600
9*x = 345600 // : 9
x = 345600/9
x = 38400
x = 38400
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