What is the value of the expression 4 times(5-2) times 2

I find it helpful to use the mnemonic PEMDAS for applying the correct order of operations. Let me decipher PEMDAS in order of first priority to last priority:

P = parenthetical expressions
E = exponentiation
M = multiplication
D = division
A = addition
S = subtraction

So, applying this mnemonic to 4 x (5-2) x 2, we get:

4 x (3) x 2

Now, we can perform the remaining operations, all multiplications,  in any order to get:

24.

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b