9=a+13

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Solution for 9=a+13 equation:


Simplifying
9 = a + 13

Reorder the terms:
9 = 13 + a

Solving
9 = 13 + 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.
9 + -1a = 13 + a + -1a

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

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

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

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

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

Simplifying
a = -4

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