The diagonal of a square is equal to the side x times square root of 2, xSqrt(2)
z = xSqrt(2), its rate of change is just Sqrt(2)
        
             
        
        
        
So, we need to consider what is being done.
So, lets start with the -3.
-3*
Now, lets see what's next
2 times a number is the same as saying 2x, then add one.
That is equal to five.  
-3(-2x+1)=5
Now,
6x-3 = 5
6x = 8
x= 8/6
 
        
             
        
        
        
4x+7 = x+10   parallel sides have to be equal in a parallelogram
subtract x
3x +7 = 10
subtract 7 from each side
3x =3
divide by 3
x =1
 
        
             
        
        
        
Answer: 6 and 3 are shown repetitive if you do 9/55 in a calculator
 
        
             
        
        
        
X/2 = 8
▶ ️2 = 8 × X. (transposing X to RHS )
▶️ 2 = 8X
▶ ️X = 8/2. (transposing 2 to RHS )
▶️ X = 4
hence the value of X is 4.