3a+18=-9

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Solution for 3a+18=-9 equation: 


Simplifying
3a + 18 = -9

Reorder the terms:
18 + 3a = -9

Solving
18 + 3a = -9

Solving for variable 'a'.

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

Add '-18' to each side of the equation.
18 + -18 + 3a = -9 + -18

Combine like terms: 18 + -18 = 0
0 + 3a = -9 + -18
3a = -9 + -18

Combine like terms: -9 + -18 = -27
3a = -27

Divide each side by '3'.
a = -9

Simplifying
a = -9

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