Tolong jawab ya penting bgttt2 soal itu :’)

(-15 + (-13)) + 23 = -5

-15 + (… + 23) = -5

(…… + 23) = -5 + 15

….. + 23 = 10

…..= 10 – 23

= -13

(-15 + (-13)) + 23 = -15 + ((-13)+ 23) = – 15 + 10