X+X+8=66

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Solution for X+X+8=66 equation: 


Simplifying
X + X + 8 = 66

Reorder the terms:
8 + X + X = 66

Combine like terms: X + X = 2X
8 + 2X = 66

Solving
8 + 2X = 66

Solving for variable 'X'.

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

Add '-8' to each side of the equation.
8 + -8 + 2X = 66 + -8

Combine like terms: 8 + -8 = 0
0 + 2X = 66 + -8
2X = 66 + -8

Combine like terms: 66 + -8 = 58
2X = 58

Divide each side by '2'.
X = 29

Simplifying
X = 29

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