$\"\"$

The word times indicates multiplication and the symbol is ( $\"\"$ ).

The word less than indicates subtraction and the symbol is ( $\"\"$ ).

The word is equal and the symbol is ( $\"\"$ ).

The word three times r represents $\"\"$ .

The word three times r less than 15 represents $\"\"$ .

The word three times r less than equals 6 represents $\"\"$ . $\"\"$

The equation is $\"\"$ .