You write it as an equation, and then solve the equation.
18
2n - 3
7
The difference of 2 times a number "n" and 6 2n-6
5000 is ten times greater than 500.
The difference between three times a number and one is two times the number.
15
14
pnis
7/ 3/
18
The difference is ten times the number.
4
2n - 3
2n is 2 times n.
64
twice the difference of three times a number and eight