a+9=-9

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Solution for a+9=-9 equation: 


Simplifying
a + 9 = -9

Reorder the terms:
9 + a = -9

Solving
9 + a = -9

Solving for variable 'a'.

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

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

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

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

Simplifying
a = -18

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