Simplify the expression below: 3(7x) -2(4-x)

a. 12-2x
b. 13+2x
c. 23x-8
d. 20x-8

The answer is

Step-by-step explanation:

First we must follow the order of operation: Please, Excuse, My, Dear, Aunt, Sally; Paranthesis, Exponents, Multiplication, Division, Addition, and Subtration.

First it says to look for parenthesis, which there are; so we do that first;.

3(7x) -2 (4 - x)

  ^

21x - 2 (4 - x)

               ^

 21x - 2 times 4 (btw, we took x away because 4 - x)

               ^ (now we do multiplcation)

      21x - 8  

           ^

           13

answer is 13 + 2x

where's the diagrams?