a+4+5=13

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Solution for a+4+5=13 equation: 


Simplifying
a + 4 + 5 = 13

Reorder the terms:
4 + 5 + a = 13

Combine like terms: 4 + 5 = 9
9 + a = 13

Solving
9 + a = 13

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + a = 13 + -9

Combine like terms: 9 + -9 = 0
0 + a = 13 + -9
a = 13 + -9

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

Simplifying
a = 4

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