Решил уравнения. x:8=800•10, x•8=800•10, 700:x=7•100

х:8=800*10х:8=8000х=8000*8х=64000х*8=800*10х*8=8000х=8000:8х=1000700:х=7*100700:х=700х=700:700х=1