You write it as an equation, and then solve the equation.
18
2n - 3
7
(6x) - (-2x) = 6x + 2x = 8x
the difference between ten and tenth is the ten is a kind of number and the tenths is a place value
15
14
pnis
7/ 3/
18
The difference is ten times the number.
2n - 3
4
The correct answer is 3x-1
2n is 2 times n.
64
twice the difference of three times a number and eight