A-3a=x

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Solution for A-3a=x equation: 


Simplifying
A + -3a = x

Solving
A + -3a = x

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 = 3a + x

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

Simplifying
A = 3a + x

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