27:X+405:9=48 24х-345:23-105 27:х+405:9=48
27:х+405:9=48 24х-345:23=105 27:х+45=48 24х-15=105 27:х=48-45 24х=105+15 27:х=48-45 24х=120 27:х=3 х=120:24 х=27:3 х=5 х=9