Ответ:
8х=240
х=240÷8
х=30
98у=98
у=1
4.7*0.83+5.3*8.3-0.83=47.0611)4.7*0.83=3.9012)5.3*8.3=43.993)3.901+43.99=47.8914)47.891-0.83=47.061