f(3)=5x-21

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Solution for f(3)=5x-21 equation: 


Simplifying
f(3) = 5x + -21

Reorder the terms for easier multiplication:
3f = 5x + -21

Reorder the terms:
3f = -21 + 5x

Solving
3f = -21 + 5x

Solving for variable 'f'.

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

Divide each side by '3'.
f = -7 + 1.666666667x

Simplifying
f = -7 + 1.666666667x

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