9=-a+13

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Solution for 9=-a+13 equation:


Simplifying
9 = -1a + 13

Reorder the terms:
9 = 13 + -1a

Solving
9 = 13 + -1a

Solving for variable 'a'.

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

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

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

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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