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x-y=-8 l x2 l 2x-2y=-16
__________ -
5y=35
y= 35/5
y = 7
x-y=-8
x-7=-8
x=-8+7
x=-1
HP : {-1,7}
x-7y = 0
-1-7.7 =0
-1-49=0
-50 =0