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0.06x+0.2y =1,44/*100
x+y=12/*(-6)
6x+20y=144
-6x-6y= -72
6x+20y=144
--------------------
-6y+20y= -72+144
14y=72/:14
y=72/14
y=36/7
y=5 1/7
x+y=12
x+5 1/7=12
x=12-5 1/7
x=6 6/7