f(x)=21+5.50x

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Solution for f(x)=21+5.50x equation: 


Simplifying
f(x) = 21 + 5.50x

Multiply f * x
fx = 21 + 5.50x

Solving
fx = 21 + 5.50x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 21x-1 + 5.50

Simplifying
f = 21x-1 + 5.50

Reorder the terms:
f = 5.50 + 21x-1

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