Question

а -12=67-27,


2) 77-c=55-22



3) 9+x=68-50

Answer 1

$1) a-12=67-27\a=67-27+12\a=52\2)77-c=55-22\-c=55-22-77\-c=-44\c=44\3)9+x=68-50\x=68-50-9\x=9$

Answer 2

а-12=67-27
67-27=40
а-12=40
а=40+12
а=52
52-12=67-27

77-с=52-22
52-22=30
72-с=30
с=72-30
с=42
72-42=52-22

9+х=68-50
68-50=18
9+х=18
х=18-9
х=9
9+9=68-50