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

The area enclosed by `f(x)=12+a x-x^2` coordinates axes and the ordinates at `x=3(f(3)>0)` is 45 sq. units. If `ma n dn` are the x-axis intercepts of the graph of `y=f(x),` then the value of `(m+n+a)` is____

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