х+325=756
х=431
900-х=516
х=384
x+325=189×4 900-x=129×4
x+325=756 900-x=516
x=756-325 x=900-516
x=431 x=384
431+325=189×4 900-384=129×4
х+325=756
х=431
900-х=516
х=384
x+325=189×4 900-x=129×4
x+325=756 900-x=516
x=756-325 x=900-516
x=431 x=384
431+325=189×4 900-384=129×4