Question

х+(540+20)=870 730-х=110

Answer 1

х+(540+20)=870
х+560=870
х=870-560
х=310
730-х=110
х=730-110
х=620

Answer 2

x+(549+20)=870

Answer 3

x=620

Answer 4

х +(540+20)=870
х+560=870
х=870-560
х=310

730-х=110
х=730-110
х=620