Question

Answer 1

\(\Leftrightarrow6x=5^2+3.4-7\Leftrightarrow6x=25+12-7\\ \Leftrightarrow6x=30\Leftrightarrow x=5\)

Answer 2

=>6x=25+12-7=36

hay x=6

Answer 3

6x=5^21-19 +3.4-7

6x=5²+12-7

6x=25+12-7

6x=30

x=30:6

x=5

tick cho mk nha!