25−5−3−17+13= 25-5-3-17+13= 25−5−3−17+13=
Due to the fact that the exercise only involves addition and subtraction operations, we will solve it from left to right:
25−5=20 25-5=20 25−5=20
20−3=17 20-3=17 20−3=17
17−17=0 17-17=0 17−17=0
0+13=13 0+13=13 0+13=13
13 13 13