=123+124+125-113-114-115
=(123-113)+ (124-114)+ (125-115)
=10+10+10
=30
\(\text{(123+ 124 + 125) – (113 + 114 + 115)}\)
\(=123+124+125-113-114-115\)
\(=\left(123-113\right)+\left(124-114\right)+\left(125-115\right)\)
\(=10+10+10=30.\)
=123+124+125-113-114-115
=(123-113)+ (124-114)+ (125-115)
=10+10+10
=30