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x+20%x-y-60%y=240
x+y=120
1,2x-0,4y=240
x=120-y
1,2*(120-y)-0,4y=240
x=120-y
144-1,2y-0,4y=240
x=120-y
-1,6y=240-144
x=120-y
-1,6y=96/:(-1,6)
x=120-y
y=-60
x=120+60
y=-60
x=180