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3x+2y=21 >x2
5x+4y=13
6x-4y=42 +
11x =55
x =55/11 =5
3x-2y=21
3.5-2y=21
15-2y=21
2y=21-15
2y=6
y=6/2 =3
HP={ (x,y) | (5,3) }