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Step-by-step explanation:
1) x=5/7 ,y= -3/2
x+y= 5/7+(-3/2)
=5/7-3/2
= 2/2(5/7)-(3/2)7/7
=10/14-21/14
=10-21/14
= -11/14
x+y= -11/14
2) x= -5/14, y= -1/21
x+y=(-5/14)+(-1/21)
=(7×-5/14)+(7×-1/21)
= 3(-5/2)+(-1/3)2
= -15-2/6
= -17/6
x+y= -17/6
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