Hi

simplify the expression. 16 + (x + 4)  =  x + 20

simplify the expression. (8 * b) * 4   =  32b

the sum of a number and 16 is 31. 

   x + 16 = 31  |subtracting 16 from both sides of equation

      x = 15    | x is equal to 15

the difference of 22 and a number is 8.

  22 - y = 8  |subtracting 8 and adding y to both sides of equation

     14 = y   | y is equal to 14

Note: when solving, we must isolate the variable on one side of the equation,

so as, we can 'read' the solution 

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