Answer:
x = 1
Explanation:
Start with the equation:
3(2x + 5) = 21.
Distribute 3 to both terms inside the parentheses:
6x + 15 = 21.
Subtract 15 from both sides to isolate the term with x:
6x = 21 - 15 = 6.
Finally, divide both sides by 6 to solve for x:
6x / 6 = 6 / 6,
x = 1
So, the value of x in the equation 3(2x + 5) = 21 is x = 1.