With this algebra question? what goes in the blank?

The answer is rounded to 1.66 because this is actually 1.66 repeated

6x + 3 = x + 13 : Find the value of x by isolating x to one side of the equation.
6x + 3 - x = x + 13 - x
6x + 3 - x = 13 : Subtracting x from both sides removes x from the right side of the equation (because x - x = 0) and maintains the equation's value.
6x + 3 - x - 3 = 13 - 3 : Renoved +3 from the left side of the equation.
6x - x = 10 
5x = 10 
5x / 5 = 10 / 5 : To find the value of x, divide x by 5. You must do the samething on each side of the equation to maintain its value.
x = 2