9a+12a=42

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Solution for 9a+12a=42 equation: 


Simplifying
9a + 12a = 42

Combine like terms: 9a + 12a = 21a
21a = 42

Solving
21a = 42

Solving for variable 'a'.

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

Divide each side by '21'.
a = 2

Simplifying
a = 2

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