13=a+9

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Solution for 13=a+9 equation:


Simplifying
13 = a + 9

Reorder the terms:
13 = 9 + a

Solving
13 = 9 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
13 + -1a = 9 + a + -1a

Combine like terms: a + -1a = 0
13 + -1a = 9 + 0
13 + -1a = 9

Add '-13' to each side of the equation.
13 + -13 + -1a = 9 + -13

Combine like terms: 13 + -13 = 0
0 + -1a = 9 + -13
-1a = 9 + -13

Combine like terms: 9 + -13 = -4
-1a = -4

Divide each side by '-1'.
a = 4

Simplifying
a = 4

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