20
X-Y
X= - 10
Y = - 30
- 10 - (-30)
- 10 + 30
= 20
-10-(-30)
-10+30=20
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20
X-Y
X= - 10
Y = - 30
- 10 - (-30)
- 10 + 30
= 20
X-Y
-10-(-30)
-10+30=20