Question

3/3n-10=9/7 demonstrati

Answer 1

[tex] \mathrm{\frac{3}{3n-10}= \frac{9}{7}} \\ \\ \mathrm{Faci~produsul~mezilor~cu~al~extremilor:} \\ \\ \mathrm{9(3n-10)=7*3} \\ \\ \mathrm{27n-90=21} \\ \\ \mathrm{27n=111} \\ \\ \mathrm{n= \frac{111}{27} }}} \\ \\ \boxed{\mathrm{n=4,(1)}}[/tex]