Simplify the following addition expression.
-15+-3
=-15+-3=-15-3=-18
Thus, -15+-3=-18
Simplify the following subtraction expression.
-6-+2
Simplify the following mathematical expression.
910-80+34-77-50
90×3+120÷50-15-5
12+3×2-16-5×2
Simplify the following mathematical expression:
555+{22+343-16÷8+13-15}