[(2x4)+(2x7)]-m=23

[(2x4)+(2x7)]-m=23

\([(2\times4)+(2\times7)]-m=23 \)       [ \({\color{blue}Compute\ the \ brackets.}\)

\(8+14-m=23\)

\(22-m=23\)

\({\color{blue}m=-1}\)   !