X+X-1=26

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Solution for X+X-1=26 equation: 


Simplifying
X + X + -1 = 26

Reorder the terms:
-1 + X + X = 26

Combine like terms: X + X = 2X
-1 + 2X = 26

Solving
-1 + 2X = 26

Solving for variable 'X'.

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

Add '1' to each side of the equation.
-1 + 1 + 2X = 26 + 1

Combine like terms: -1 + 1 = 0
0 + 2X = 26 + 1
2X = 26 + 1

Combine like terms: 26 + 1 = 27
2X = 27

Divide each side by '2'.
X = 13.5

Simplifying
X = 13.5

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