I'm thinking of a number

then I multiply it by 3

then I add 4

then divide the answer by 4

my final answer is 3 less than the number I thought of in the beginning

what is the number I'm thinking of

16

? * 3 + 4 ÷ 4 = ? - 3

16 * 3 + 4 ÷ 4

48 + 4 ÷ 4

52 ÷ 4

13

13 3 less than 16

Let N be the number

( [ N * 3] + 4 ) / 4 = N - 3

(3N + 4 ) / 4 = N - 3 multiply both sides by 4

3N + 4 = 4 (N - 3)

3N + 4 = 4N - 12 add 12 to both sides, subtract 3N from both sides

16 = N

So

16 - 3 = 13