a-12=-28

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Solution for a-12=-28 equation: 


Simplifying
a + -12 = -28

Reorder the terms:
-12 + a = -28

Solving
-12 + a = -28

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + a = -28 + 12

Combine like terms: -12 + 12 = 0
0 + a = -28 + 12
a = -28 + 12

Combine like terms: -28 + 12 = -16
a = -16

Simplifying
a = -16

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