f(x)=5+8

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Solution for f(x)=5+8 equation: 


Simplifying
f(x) = 5 + 8

Multiply f * x
fx = 5 + 8

Combine like terms: 5 + 8 = 13
fx = 13

Solving
fx = 13

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 13x-1

Simplifying
f = 13x-1

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