3a-6=9

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Solution for 3a-6=9 equation: 


Simplifying
3a + -6 = 9

Reorder the terms:
-6 + 3a = 9

Solving
-6 + 3a = 9

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + 6 + 3a = 9 + 6

Combine like terms: -6 + 6 = 0
0 + 3a = 9 + 6
3a = 9 + 6

Combine like terms: 9 + 6 = 15
3a = 15

Divide each side by '3'.
a = 5

Simplifying
a = 5

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