f(-3)=4x-21

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Solution for f(-3)=4x-21 equation: 


Simplifying
f(-3) = 4x + -21

Reorder the terms for easier multiplication:
-3f = 4x + -21

Reorder the terms:
-3f = -21 + 4x

Solving
-3f = -21 + 4x

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 + -1.333333333x

Simplifying
f = 7 + -1.333333333x

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