Tìm \(\large x\) biết: \(\large 16 \times x - 9 \times x = 21 \times 3

Tìm \(\large x\) biết:

\(\large 16 \times x - 9 \times x = 21 \times 3\)

• A.

  \(\large x\) = |

  9

\(\large 16 \times x - 9 \times x = 21 \times 3\)

\(\large 7 \times x = 63\)

\(\large x = 63 : 7\)

\(\large x = 9\)