How to do this question?

STEP BY STEP
200+[-55]+[-77]+ [-68]
200+[-55-77-68]
200+[-200]
200 -200
0
PLEASE PLEASE MAKE ME THE BRAINLIST
Answer:
0
Step-by-step explanation:
We know that,
( + ) × ( + ) = ( + )
( - ) × ( - ) = ( + )
( + ) × ( - ) = ( - )
By keeping the above in mind let us solve this.
200 + ( -55 ) + ( -77) + ( - 68 )
200 - 55 - 77 - 68
145 - 77 - 68
68 - 68
0