X+(x+2)+(x+4)=21

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Solution for X+(x+2)+(x+4)=21 equation:


Simplifying
X + (x + 2) + (x + 4) = 21

Reorder the terms:
X + (2 + x) + (x + 4) = 21

Remove parenthesis around (2 + x)
X + 2 + x + (x + 4) = 21

Reorder the terms:
X + 2 + x + (4 + x) = 21

Remove parenthesis around (4 + x)
X + 2 + x + 4 + x = 21

Reorder the terms:
2 + 4 + X + x + x = 21

Combine like terms: 2 + 4 = 6
6 + X + x + x = 21

Combine like terms: x + x = 2x
6 + X + 2x = 21

Solving
6 + X + 2x = 21

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 + X + -6 + 2x = 21 + -6

Reorder the terms:
6 + -6 + X + 2x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + X + 2x = 21 + -6
X + 2x = 21 + -6

Combine like terms: 21 + -6 = 15
X + 2x = 15

Add '-2x' to each side of the equation.
X + 2x + -2x = 15 + -2x

Combine like terms: 2x + -2x = 0
X + 0 = 15 + -2x
X = 15 + -2x

Simplifying
X = 15 + -2x

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