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-3y+3x=12
1/3x+1,5y=-0,5
3x=12+3y /:3
1/3x+1,5y= -0,5 /*3
x=4+y
x+4,5y= -1,5
x=4+y
4+y+4,5y= -1,5
x=4+y
4+1,5= -5,5y
x=4+y
5,5= - 5,5y /: (-5,5)
x=4+y
-1 = y
x=4 -1
y=-1
x=3
ODP: A