389+(х-47)=819 900÷а=180÷4 (х+631)-567=666 47*х=611

Question

389+(х-47)=819 900÷а=180÷4 (х+631)-567=666 47*х=611

Answer 1

389+(×_47)=819
×_47=819_÷89
×_47=430
×=430+47
×=477
389+(477_47)=819
389+430=819