a-(180-a)=90

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Solution for a-(180-a)=90 equation:


Simplifying
a + -1(180 + -1a) = 90
a + (180 * -1 + -1a * -1) = 90
a + (-180 + 1a) = 90

Reorder the terms:
-180 + a + 1a = 90

Combine like terms: a + 1a = 2a
-180 + 2a = 90

Solving
-180 + 2a = 90

Solving for variable 'a'.

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

Add '180' to each side of the equation.
-180 + 180 + 2a = 90 + 180

Combine like terms: -180 + 180 = 0
0 + 2a = 90 + 180
2a = 90 + 180

Combine like terms: 90 + 180 = 270
2a = 270

Divide each side by '2'.
a = 135

Simplifying
a = 135

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