Corectăm enunțul:
[tex]\it Se\ \ consider\breve a\ \ func\c{\it t}ia\\ \\ f:\mathbb{R}\ \longrightarrow\ \mathbb{R},\ \ f(x)=-2x+7\\ \\ Afla\c{\it t}i\ \ m\in\mathbb{R},\ \ pentru\ \ care\ \ f(m)=-4[/tex]
[tex]\it \mathcal{R} :\\ \\ f(x)=-2x+7\ \Rightarrow\ f(m)=-2m+7\ \ \ \ \ (1)\\ \\ f(m)=-4\ \ \ \ \ \ (2)\\ \\ (1),\ (2)\ \Rightarrow\ -2m+7=-4\ \Rightarrow 7+4=2m \Rightarrow 11=2m|_{:2} \Rightarrow m=5,5[/tex]
