a+4=13

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Solution for a+4=13 equation: 


Simplifying
a + 4 = 13

Reorder the terms:
4 + a = 13

Solving
4 + a = 13

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + a = 13 + -4

Combine like terms: 4 + -4 = 0
0 + a = 13 + -4
a = 13 + -4

Combine like terms: 13 + -4 = 9
a = 9

Simplifying
a = 9

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