It is: 7+13-6+5 = 19
1 + 6 + 9 - 8 + 4 - 5 + 2 + 3 = -6
5m + 7 - 2m - 1 = 3m + 6
6 - 8 + 3 = -5
Zero
6 + -2 = 4
6-2 = 4 8+7 ≠3 9+5 = 14
Six times 5^2 minus 5 times 4 plus 8 is equal to 138.
17
-5 + (-4) - 12 - 20 - (-10) + 6 = -25
-6
-6+1= -5