X+21=30

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Solution for X+21=30 equation: 


Simplifying
X + 21 = 30

Reorder the terms:
21 + X = 30

Solving
21 + X = 30

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + X = 30 + -21

Combine like terms: 21 + -21 = 0
0 + X = 30 + -21
X = 30 + -21

Combine like terms: 30 + -21 = 9
X = 9

Simplifying
X = 9

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