Final answer:
To solve the equation 168 = 18x + 12(2x), combine like terms and solve for x. The value of x is 4.
Step-by-step explanation:
To solve the equation 168 = 18x + 12(2x), we can combine like terms and then solve for x. First, distribute the 12 to 2x, which gives us 24x. Then, combine the x terms: 18x + 24x = 42x. Next, subtract 42x from both sides: 168 - 42x = 0. Finally, subtract 168 from both sides and divide by -42 to solve for x: x = -168/-42 = 4.