A+3a+9a=480

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Solution for A+3a+9a=480 equation: 


Simplifying
A + 3a + 9a = 480

Combine like terms: 3a + 9a = 12a
A + 12a = 480

Solving
A + 12a = 480

Solving for variable 'A'.

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

Add '-12a' to each side of the equation.
A + 12a + -12a = 480 + -12a

Combine like terms: 12a + -12a = 0
A + 0 = 480 + -12a
A = 480 + -12a

Simplifying
A = 480 + -12a

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