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16 = (1600-(2*x))/40 // - (1600-(2*x))/40
16-((1600-(2*x))/40) = 0
16-((1600-2*x)/40) = 0
(-1*(1600-2*x))/40+16 = 0
(-1*(1600-2*x))/40+(16*40)/40 = 0
16*40-1*(1600-2*x) = 0
2*x-960 = 0
(2*x-960)/40 = 0
(2*x-960)/40 = 0 // * 40
2*x-960 = 0
2*x-960 = 0 // + 960
2*x = 960 // : 2
x = 960/2
x = 480
x = 480
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