x+700+900=480000
х=700+900=1600
х=480000:1600
х=300
х=700*300=210000
х=900*300=270000
х=210000+270000=480000
x+700+900=480000
х=700+900=1600
х=480000:1600
х=300
х=700*300=210000
х=900*300=270000
х=210000+270000=480000