309+x=321

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Solution for 309+x=321 equation: 


Simplifying
309 + x = 321

Solving
309 + x = 321

Solving for variable 'x'.

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

Add '-309' to each side of the equation.
309 + -309 + x = 321 + -309

Combine like terms: 309 + -309 = 0
0 + x = 321 + -309
x = 321 + -309

Combine like terms: 321 + -309 = 12
x = 12

Simplifying
x = 12

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