Question

solve for x.

x - x + 2x + x = 18

x = \boxed{}

Explanation:

Step1: Combine like terms

$x - x + 2x + x=(1 - 1 + 2 + 1)x$

Step2: Simplify the coefficient

$(1 - 1 + 2 + 1)x = 3x$，so the equation becomes $3x = 18$

Step3: Solve for x

Divide both sides by 3: $x=\frac{18}{3}$

Step4: Calculate the result

$\frac{18}{3}=6$

Answer:

6