The absolute value of -3 is 0-3 = 3), the sum of two positive numbers is positive, and then the absolute values are added. Such as -3+-2=-(3+2)=-5.
Positive plus negative, take the sign of the number with large absolute value, and then subtract the small absolute value from the large absolute value, such as -3+5=+(5-3)=+2.
-6+2=-(6-2)=-4