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c) X = 12 , y = 7
X - Y = 5........ ( 1 )
X + Y = 19........ ( 2 )
Add both the equation :-
2X = 24...... ( y will get cancelled )
X = 24/2
Substitute the value of X in ( 2 )
12 + Y = 19
Y = 19 - 12
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