How do we write the quotient of a number c and 7 is 20 in an equation

Alicense plate is to consist of 44 digits followed by 55 uppercase letters. determine the number of different license plates possible if the first and second digits must be? odd, and repetition is not permitted.

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

X+ y = 5 ; x - y =3 solve using linear combination