a=30-a

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Solution for a=30-a equation: 


Simplifying
a = 30 + -1a

Solving
a = 30 + -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.
a + a = 30 + -1a + a

Combine like terms: a + a = 2a
2a = 30 + -1a + a

Combine like terms: -1a + a = 0
2a = 30 + 0
2a = 30

Divide each side by '2'.
a = 15

Simplifying
a = 15

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