Notice this is a geometric progression since each number multiplied by some factor equals the next number in the sequence, in this case,

Then by applying the formula for sum to infinity of a geometric progression,
 
 
        
        
        
10 because you know that the decimal moves one to the left if you are dividing by ten and one to the right if you are multiplying by ten.
Check your work. 0.32 divided by 10 is 0.032
 
        
                    
             
        
        
        
-12 + 3x + 2 = 5x - 10 - 8x 
-10 + 3x = -3x -10
-10 + 6x = -10
6x = 0 
x = 0