<h3>since the equation is f ( x ) = 6x - 3 and we have to find f ( - 3 ) ...</h3><h3>replace x in the f ( x ) equation with - 3</h3><h3>that will give us f ( - 3 ) = 6 ( - 3 ) - 3 </h3><h3>solve the equation </h3><h3>we will get - 21</h3><h3>so your answer should be f ( - 3 ) = - 21</h3>