f(x)=-3x+21

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


Simplifying
f(x) = -3x + 21

Multiply f * x
fx = -3x + 21

Reorder the terms:
fx = 21 + -3x

Solving
fx = 21 + -3x

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 + -3

Simplifying
f = 21x-1 + -3

Reorder the terms:
f = -3 + 21x-1

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