A+3a=12

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Solution for A+3a=12 equation: 


Simplifying
A + 3a = 12

Solving
A + 3a = 12

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 = 12 + -3a

Combine like terms: 3a + -3a = 0
A + 0 = 12 + -3a
A = 12 + -3a

Simplifying
A = 12 + -3a

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