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0.35 = (20-x)/20 // - (20-x)/20
0.35-((20-x)/20) = 0
(-1*(20-x))/20+0.35 = 0
(-1*(20-x))/20+(0.35*20)/20 = 0
0.35*20-1*(20-x) = 0
x-13 = 0
(x-13)/20 = 0
(x-13)/20 = 0 // * 20
x-13 = 0
x-13 = 0 // + 13
x = 13
x = 13
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