3+x+2x=18

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Solution for 3+x+2x=18 equation: 


Simplifying
3 + x + 2x = 18

Combine like terms: x + 2x = 3x
3 + 3x = 18

Solving
3 + 3x = 18

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + 3x = 18 + -3

Combine like terms: 3 + -3 = 0
0 + 3x = 18 + -3
3x = 18 + -3

Combine like terms: 18 + -3 = 15
3x = 15

Divide each side by '3'.
x = 5

Simplifying
x = 5

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