Calculate $\frac { \partial f } { \partial x }$ , And

Short Answer

Calculate $\frac { \partial f } { \partial x }$ , and $\left. \frac { \partial f } { \partial y } \right| _ { ( 2,3 ) }$ when defined.
​ $f ( x , y ) = 1,140 - 6 x + 7 y$ ​
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