Răspuns :
[tex]\it 3-4(4-5x)=3(5x+1) \Rightarrow 3-16+20x=15x+3 \Rightarrow 20x-15x=3-3+16 \Rightarrow \\ \\ \Rightarrow 5x=16 \Rightarrow x=\dfrac{^{2)}16}{\ 5}=\dfrac{32}{10}=3,2[/tex]
[tex]\it 3-4(4-5x)=3(5x+1) \Rightarrow 3-16+20x=15x+3 \Rightarrow 20x-15x=3-3+16 \Rightarrow \\ \\ \Rightarrow 5x=16 \Rightarrow x=\dfrac{^{2)}16}{\ 5}=\dfrac{32}{10}=3,2[/tex]