2x+3y=5 and x-2y-3=0
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2x+3y=5 (x-2y-3)×3=0
(x-2y-3=0)×2 (2x+3y=5)×2
=2x-4y=6 =3x-6y=9
=2x+3y=5 =4x+6y=10
=-7y=1 =x=1
y=-1/7
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