X+9=21+x

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Solution for X+9=21+x equation: 


Simplifying
X + 9 = 21 + x

Reorder the terms:
9 + X = 21 + x

Solving
9 + X = 21 + x

Solving for variable 'X'.

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

Add '-9' to each side of the equation.
9 + -9 + X = 21 + -9 + x

Combine like terms: 9 + -9 = 0
0 + X = 21 + -9 + x
X = 21 + -9 + x

Combine like terms: 21 + -9 = 12
X = 12 + x

Simplifying
X = 12 + x

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