Answer:

-6

Step-by-step explanation:

6 + 3 × (5 - 8) - 3

Use PEMDAS

6 + 3 × (5 - 8) - 3

6 + 3 × (-3) - 3

6 + (-9) - 3

-3 - 3

Use KCC (KEEP CHANGE CHANGE)

Keep the Minuend

Change the sign

Change the subtrahend

-3 - 3

-3 + (-3)

-6