a+b+x=c

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Solution for a+b+x=c equation: 


Simplifying
a + b + x = c

Solving
a + b + x = c

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 + x = -1b + c

Combine like terms: b + -1b = 0
a + 0 + x = -1b + c
a + x = -1b + c

Add '-1x' to each side of the equation.
a + x + -1x = -1b + c + -1x

Combine like terms: x + -1x = 0
a + 0 = -1b + c + -1x
a = -1b + c + -1x

Simplifying
a = -1b + c + -1x

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