Răspuns :
2x - m = 0
x = 7
_________________
m = ?
( 2 × 7 ) - m 0
14 - m = 0
- m = - 14 l × ( -1 )
m = 14
x = 7
_________________
m = ?
( 2 × 7 ) - m 0
14 - m = 0
- m = - 14 l × ( -1 )
m = 14