Find the point on the graph of the given function at which the slope of the tangent line is the given slope.

$f(x)=5x^2+3x-9$; slope $of$ the tangent line $=-4$

The point at which the slope of the tangent line is $-4$ is $($Simplify your answer. Type an ordered pair.$)$

an example

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$1,627$

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$(1)$