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Please help

Let $f(x)=31?x_{3}+21?x_{2}?11x+1$ (a) Find the points on the graph of $f$ at which the slope of the tangent line is equal to $?5$. (If an answer does not exist, enter DNE.) smaller $x$-value $(x,y)=(x?)$ larger $x$-value $(x,y)=(x)$ (b) Find the equation(s) of the tangent line(s) of part (a). (Let $x$ be the independent variable and $y$ be the dependent variable. If an answer does not exist, enter DNE.) smaller $x$-value $y=$ larger $x$-value $y=$