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2x+3y=12
2x-y=4
_________-
4y=8
y=8/4
y="2"....................... 2x-y=4
2x-2=4
x=4+2/2 = "3"
HP={3,2}
3x+y=15
x+y=7
_______-
2x=8
x = 8/2 = 4.................. x+y=7
4+y=7
y= 7-4 = 3
HP={4,3}