X+X-16=20

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Solution for X+X-16=20 equation: 


Simplifying
X + X + -16 = 20

Reorder the terms:
-16 + X + X = 20

Combine like terms: X + X = 2X
-16 + 2X = 20

Solving
-16 + 2X = 20

Solving for variable 'X'.

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

Add '16' to each side of the equation.
-16 + 16 + 2X = 20 + 16

Combine like terms: -16 + 16 = 0
0 + 2X = 20 + 16
2X = 20 + 16

Combine like terms: 20 + 16 = 36
2X = 36

Divide each side by '2'.
X = 18

Simplifying
X = 18

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