How to solve the math problem (- 16) - (- 12) - 24 - (18)

How to solve the math problem (- 16) - (- 12) - 24 - (18)

(-16)-(-12)-24-(18)
=(-16)+12+(-24)+18
=【(-16)+(-24)】+(12+18)
==【(-40)+30】
=-10