X+2X+(X+4)=12

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Solution for X+2X+(X+4)=12 equation:


Simplifying
X + 2X + (X + 4) = 12

Reorder the terms:
X + 2X + (4 + X) = 12

Remove parenthesis around (4 + X)
X + 2X + 4 + X = 12

Reorder the terms:
4 + X + 2X + X = 12

Combine like terms: X + 2X = 3X
4 + 3X + X = 12

Combine like terms: 3X + X = 4X
4 + 4X = 12

Solving
4 + 4X = 12

Solving for variable 'X'.

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

Add '-4' to each side of the equation.
4 + -4 + 4X = 12 + -4

Combine like terms: 4 + -4 = 0
0 + 4X = 12 + -4
4X = 12 + -4

Combine like terms: 12 + -4 = 8
4X = 8

Divide each side by '4'.
X = 2

Simplifying
X = 2

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