12.99+x=21.39

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Solution for 12.99+x=21.39 equation: 


Simplifying
12.99 + x = 21.39

Solving
12.99 + x = 21.39

Solving for variable 'x'.

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

Add '-12.99' to each side of the equation.
12.99 + -12.99 + x = 21.39 + -12.99

Combine like terms: 12.99 + -12.99 = 0.00
0.00 + x = 21.39 + -12.99
x = 21.39 + -12.99

Combine like terms: 21.39 + -12.99 = 8.4
x = 8.4

Simplifying
x = 8.4

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