$(7\mathrm{.}5$ points$)$ Solve the linear inequality $3x-16x+5.$ Express the solution set in interval

notation and graph it$.$

$(7\mathrm{.}5$ point$)$ Determine the value$($s$)$ of $k$ so that the equation $x^2+4kx+(3+11k)=0$

only one real solution. Then, find this real root using the quadratic formula