Question

а-12=67-27




77-с=55-22



9+с=55-22

Answer 1

а-12=67-27
а-12=40
а=40+12
а=52

77-с=55-22
77-с=33
с=77-33
с=44

9+с=55-22
9+с=33
с=33-9
с=24