x+21=12

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Solution for x+21=12 equation: 


Simplifying
x + 21 = 12

Reorder the terms:
21 + x = 12

Solving
21 + x = 12

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 = 12 + -21

Combine like terms: 21 + -21 = 0
0 + x = 12 + -21
x = 12 + -21

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

Simplifying
x = -9

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