6a+3a=45

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Solution for 6a+3a=45 equation: 


Simplifying
6a + 3a = 45

Combine like terms: 6a + 3a = 9a
9a = 45

Solving
9a = 45

Solving for variable 'a'.

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

Divide each side by '9'.
a = 5

Simplifying
a = 5

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