Question

4•x=28•10 полный пример можно

Answer 1

$4 \times x = 28 \times 10 \\ 4 \times x = 280 \\ x = 280 \div4 \\ x = 70 \\ - - - - - - - - - \\ 70 \times 4 = 28 \times 10 \\ 280 = 280$