X+X+3=20

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Solution for X+X+3=20 equation: 


Simplifying
X + X + 3 = 20

Reorder the terms:
3 + X + X = 20

Combine like terms: X + X = 2X
3 + 2X = 20

Solving
3 + 2X = 20

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + -3 + 2X = 20 + -3

Combine like terms: 3 + -3 = 0
0 + 2X = 20 + -3
2X = 20 + -3

Combine like terms: 20 + -3 = 17
2X = 17

Divide each side by '2'.
X = 8.5

Simplifying
X = 8.5

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