Question

What is the value of x in the equation 3(4x + 6) = 21?

Answer 1

For this case we must find the value of the variable "x" of the following equation:

$3 (4x + 6) = 21$

We apply distributive property to the terms within parentheses:

$12x + 18 = 21$

We subtract 18 from both sides of the equation:

$12x + 18-18 = 21-18$

We divide between 12 on both sides of the equation:

$12x = 3$

$x = \frac {3} {12}\\x = \frac {1} {4}$

Answer:

$x = \frac {1} {4}$