x + y = 5 multiply by 2x - 3y = 4
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x + y - 5 = 0
2x - 3y - 4 = 0
( x + y - 5 )*( 2x - 3y - 4 ) = 0
(2x^2)+2xy-10x-3xy-(3y^2)+15y-4x+4y+20=0
2x^2 -3y^2 - xy -14x +19y +20 = 0
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