if x+y=15then(x-10)^3+(y-5)^3=?
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x+y=15
x-10=5-y
(x-10)^3+(y-5)^3
(5-y)^3+(y-5)^3
(5-y)^3-(5-y)^3
=0
x-10=5-y
(x-10)^3+(y-5)^3
(5-y)^3+(y-5)^3
(5-y)^3-(5-y)^3
=0
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