A+a+a=90

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Solution for A+a+a=90 equation: 


Simplifying
A + a + a = 90

Combine like terms: a + a = 2a
A + 2a = 90

Solving
A + 2a = 90

Solving for variable 'A'.

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

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

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

Simplifying
A = 90 + -2a

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