Observe the following:  $$1\oplus 5=1+2+3+4-5$$  $$3\oplus 8=3+4+5+6+7-8$$  $$5\oplus 9=5+6+7+8-9$$  Find the value of $$\left( 5\oplus 10 \right)-\left( 4\oplus 9 \right)$$. 
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