If 3x + 2y = 13 and 2x + 3y = 12, then the value of x + y is .............. .
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Ans, x+y = 5
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3x+2y=13........(1)
2x+3y=12..........(2)
adding equation 1 and 2
3x+2y=13
2x+3y=12
________
5x+5y,=25
common is 5
5(x+y)=25
(x+y)=25/5
(x+y)=5
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