[tex]f(x) = 4x + 5 \\ 0 = 4x + 5 \\ - 4x = 5 \: \: \: . \: ( - 1)\\ 4x = - 5 \\ \boxed{\boxed{\boxed{x = - \frac{5}{4} }}} \\ [/tex]
atte. yrz
