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x+y=2l
12/100+20/100=140/1000
x+y=2l /*(-12/100)
12/100+20 100=140/1000
-12/100x - 12/100y=-0,24
-8/100y=-1/10
8/100y=1/10 /:8/100
y=1/10*1008
y=1,25l
x+1,25l=2l
x=2l-1,25l
x=0,75l
x=0,75l
y=1,25l