2x-y=7and -x+2y=3 find x+y
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2x-y=7,
-x+2y=3
so,
(2x-y)+(-x+2y)=(7)+(3)
2x-x-y+2y=10
x+y=10
-x+2y=3
so,
(2x-y)+(-x+2y)=(7)+(3)
2x-x-y+2y=10
x+y=10
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