f(x)=(x-4)21

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Solution for f(x)=(x-4)21 equation: 


Simplifying
f(x) = (x + -4) * 21

Multiply f * x
fx = (x + -4) * 21

Reorder the terms:
fx = (-4 + x) * 21

Reorder the terms for easier multiplication:
fx = 21(-4 + x)
fx = (-4 * 21 + x * 21)
fx = (-84 + 21x)

Solving
fx = -84 + 21x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -84x-1 + 21

Simplifying
f = -84x-1 + 21

Reorder the terms:
f = 21 + -84x-1

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