x+a=13

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Solution for x+a=13 equation: 


Simplifying
x + a = 13

Reorder the terms:
a + x = 13

Solving
a + x = 13

Solving for variable 'a'.

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

Add '-1x' to each side of the equation.
a + x + -1x = 13 + -1x

Combine like terms: x + -1x = 0
a + 0 = 13 + -1x
a = 13 + -1x

Simplifying
a = 13 + -1x

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