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20*x+7800/4500 = 28*x+11050/6400 // - 28*x+11050/6400
20*x-(28*x)+7800/4500-(11050/6400) = 0
20*x-28*x+7800/4500-221/128 = 0
13/1920-8*x = 0 // - 13/1920
-8*x = -13/1920 // : -8
x = -13/1920/(-8)
x = 13/15360
x = 13/15360
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