9a-3a=42

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Solution for 9a-3a=42 equation: 


Simplifying
9a + -3a = 42

Combine like terms: 9a + -3a = 6a
6a = 42

Solving
6a = 42

Solving for variable 'a'.

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

Divide each side by '6'.
a = 7

Simplifying
a = 7

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