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6x+6y=5 |x2
=12x-18y=0
=12x+12y=10
-------------------
6y=-10
y=-10/6
2x-3y=0
2x-3(10/6)=0
2x-30/6=0
2x-5=0
2x=5
x=5/2
HP{-10/6,5/2}