f(-3)=12-3*-3

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Solution for f(-3)=12-3*-3 equation: 


Simplifying
f(-3) = 12 + -3 * -3

Reorder the terms for easier multiplication:
-3f = 12 + -3 * -3

Multiply -3 * -3
-3f = 12 + 9

Combine like terms: 12 + 9 = 21
-3f = 21

Solving
-3f = 21

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

Simplifying
f = -7

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