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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