A+B-12=C

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Solution for A+B-12=C equation: 


Simplifying
A + B + -12 = C

Reorder the terms:
-12 + A + B = C

Solving
-12 + A + B = C

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 + A + 12 + B = 12 + C

Reorder the terms:
-12 + 12 + A + B = 12 + C

Combine like terms: -12 + 12 = 0
0 + A + B = 12 + C
A + B = 12 + C

Add '-1B' to each side of the equation.
A + B + -1B = 12 + -1B + C

Combine like terms: B + -1B = 0
A + 0 = 12 + -1B + C
A = 12 + -1B + C

Simplifying
A = 12 + -1B + C

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