78+(45+х)=7845 уравнение

Question

78+(45+х)=7845 уравнение

Answer 1

45+x=7845+78
45+x=78529
x=78529-45
×=78529

Answer 2

78+(45+x)=7845 45+x=7845-78 45+x=7767 X=7767-45 X=7722