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y-x=1,8
0,5x+1,8+x=7,5
y=1,8+x
1,5x+1,8=7,5
y=1,8+x
1,5x=7,5-1,8
y=1,8+X
1,5x=5,7
y=1,8+x
x=3,8
y=1,8+3,8
x=3,8
y=5,6
KONIEC :D