f(4)=21x+13

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Solution for f(4)=21x+13 equation: 


Simplifying
f(4) = 21x + 13

Reorder the terms for easier multiplication:
4f = 21x + 13

Reorder the terms:
4f = 13 + 21x

Solving
4f = 13 + 21x

Solving for variable 'f'.

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

Divide each side by '4'.
f = 3.25 + 5.25x

Simplifying
f = 3.25 + 5.25x

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