You just do the opposite operations. Since it says divided by 5, the result is 6, so you do the opposite of dividing, which is multiplying. So you multiply 6 and 5 to get 30. Now it says increased by 26, so you just do the opposite which is subtracting. So 30 minus 26 is 4. That is the number.
x = number
x + 26 = ? / 5 = 6
5 x 6 = 30
?= 30
30 - 26 = 4
x = 4
Check your work:
4 + 26 = 30
30 / 5 = 6