Question

(80-7)+13=
52-(6+18)=
(60+8)-19=
40-(21-7)=

Answer 1

(80-7)+13= 73+13=86

 52-(6+18)=52-24=28

 (60+8)-19=68-19=49

 40-(21-7)=40-14=26

Answer 2

(80-7)+13=73+13=86
52-(6+18)=52-24=28
(60+8)-19=68-19=49
40-(21-7)=40-14=26