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The area enclosed by f(x)=12+ax-x^(2) co...

The area enclosed by `f(x)=12+ax-x^(2)` coordinates axes and the coordinates at `x=3(f(3)gt0)` is 45 sq. units. If m and n are the x-axis intercepts of the graph of y=f(x), then the value of (m+n+a) is ___.

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