f(a+b)=x

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Solution for f(a+b)=x equation: 


Simplifying
f(a + b) = x
(a * f + b * f) = x
(af + bf) = x

Solving
af + bf = x

Solving for variable 'a'.

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

Add '-1bf' to each side of the equation.
af + bf + -1bf = -1bf + x

Combine like terms: bf + -1bf = 0
af + 0 = -1bf + x
af = -1bf + x

Divide each side by 'f'.
a = -1b + f-1x

Simplifying
a = -1b + f-1x

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