9-12+2a=27

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Solution for 9-12+2a=27 equation: 


Simplifying
9 + -12 + 2a = 27

Combine like terms: 9 + -12 = -3
-3 + 2a = 27

Solving
-3 + 2a = 27

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + 3 + 2a = 27 + 3

Combine like terms: -3 + 3 = 0
0 + 2a = 27 + 3
2a = 27 + 3

Combine like terms: 27 + 3 = 30
2a = 30

Divide each side by '2'.
a = 15

Simplifying
a = 15

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