A+b+c=21

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Solution for A+b+c=21 equation: 


Simplifying
A + b + c = 21

Solving
A + b + c = 21

Solving for variable 'A'.

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

Add '-1b' to each side of the equation.
A + b + -1b + c = 21 + -1b

Combine like terms: b + -1b = 0
A + 0 + c = 21 + -1b
A + c = 21 + -1b

Add '-1c' to each side of the equation.
A + c + -1c = 21 + -1b + -1c

Combine like terms: c + -1c = 0
A + 0 = 21 + -1b + -1c
A = 21 + -1b + -1c

Simplifying
A = 21 + -1b + -1c

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