a-12.3=15

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Solution for a-12.3=15 equation: 


Simplifying
a + -12.3 = 15

Reorder the terms:
-12.3 + a = 15

Solving
-12.3 + a = 15

Solving for variable 'a'.

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

Add '12.3' to each side of the equation.
-12.3 + 12.3 + a = 15 + 12.3

Combine like terms: -12.3 + 12.3 = 0.0
0.0 + a = 15 + 12.3
a = 15 + 12.3

Combine like terms: 15 + 12.3 = 27.3
a = 27.3

Simplifying
a = 27.3

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