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x-0,2y=60
x+0,2y=140
x-0,2y=60
2x=200
x=100
y=200
x - 1/5 y = 60 | *5
5x + y = 700
5x - y = 300
sumujemy stronami
10x = 1000
x = 100
5x + y = 700
5*100 + y = 700
500 + y = 700
y = 700 - 500
y = 200