Not calculus. In the case of having a plus sign in front of a minus sign, the result is to subtract the number. The same goes for if you have a minus sign in front of a plus sign. Remember that if the signs are different, the result will be a subtraction, if the signs are the same, it will be an addition (ie a double negative (- -), or a double positive(+ +)). So this question, 26 + -3 -11 is the same as 26 -3 -11, so will equal 12.
-26
3+26+24= 53
40
131
112
60
26
The answer to the math problem of 3 plus 2 2 6-26 plus 3-2 is 2.
7/13 + 11/26 = 325/338 which reduces to 25/26
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
10+11+9+3= 33
(11/20) + (3/4) = (11/20) + (15/20) = 26/20 = 13/10 = 1.3