A+a+a+a=28

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Solution for A+a+a+a=28 equation: 


Simplifying
A + a + a + a = 28

Combine like terms: a + a = 2a
A + 2a + a = 28

Combine like terms: 2a + a = 3a
A + 3a = 28

Solving
A + 3a = 28

Solving for variable 'A'.

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

Add '-3a' to each side of the equation.
A + 3a + -3a = 28 + -3a

Combine like terms: 3a + -3a = 0
A + 0 = 28 + -3a
A = 28 + -3a

Simplifying
A = 28 + -3a

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