You mean;
A number is multiplied by 6, then 4 is added to the product. The result is 82. What is the number?
So, lets call the number 'x'
6 multiplied by x plus 4 equals 82
So,
6x + 4 = 82
Now subtract 4 from both sides of the equation:
6x + 4 - 4 = 82 - 4
6x = 78
Now divide both sides of the equation by 6 to find the value of 'x':
(6x)/6 = 78/6
x = 13
So the number you wanted to find is 13