12 ×4la puterea x -5×4 la puterea x =7×2 la puterea 12

Răspuns :

4^x( 12-5) =7*2^12

7*4^x=7*2^12

4^x=2^12

(2²)^x=2^12

2^(2x) =2^12

2=2⇒2x=12⇒x=6