x+6+3x=18

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Solution for x+6+3x=18 equation: 


Simplifying
x + 6 + 3x = 18

Reorder the terms:
6 + x + 3x = 18

Combine like terms: x + 3x = 4x
6 + 4x = 18

Solving
6 + 4x = 18

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 4x = 18 + -6

Combine like terms: 6 + -6 = 0
0 + 4x = 18 + -6
4x = 18 + -6

Combine like terms: 18 + -6 = 12
4x = 12

Divide each side by '4'.
x = 3

Simplifying
x = 3

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