Question

700-x=178+212
a+125=471-68

Answer 1

700-х=390
х=700-390
х=310
700-310=390

Answer 2

700-х=178+212
700-х=390
х=700-390
х=310
700-310=178+212
390=390
а+125=471-68
а+125=403
а=403-125
а=278
278+125=471-68
403=403