A+B+C=400

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Solution for A+B+C=400 equation: 


Simplifying
A + B + C = 400

Solving
A + B + C = 400

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 = 400 + -1B

Combine like terms: B + -1B = 0
A + 0 + C = 400 + -1B
A + C = 400 + -1B

Add '-1C' to each side of the equation.
A + C + -1C = 400 + -1B + -1C

Combine like terms: C + -1C = 0
A + 0 = 400 + -1B + -1C
A = 400 + -1B + -1C

Simplifying
A = 400 + -1B + -1C

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