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1,5y-6x-4,5y=0
4y+9x=11 i 2/3
II
-3y-6x=0 |*9
4y+9x=35/3 |*6
III
-27y-54x=0
24y+54x=70
IV
y=-70/3
V
4*(-70/3)+9x=35/3
-280/3-35/3=-9x
x=35/3