Find the value of the variable such that: the value of 5−a is 20 greater than the value of 6a−1

Answer 1

So, put your words into algebra:
5-a = 20 + 6a-1
now do the math.

Answer 2

5-a=20+6a-1, 6-a=+6a, -14-a=6-, -14=7a, -2=a. Your welcome