f(-1)=4(-1)-9

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Solution for f(-1)=4(-1)-9 equation: 


Simplifying
f(-1) = 4(-1) + -9

Reorder the terms for easier multiplication:
-1f = 4(-1) + -9

Multiply 4 * -1
-1f = -4 + -9

Combine like terms: -4 + -9 = -13
-1f = -13

Solving
-1f = -13

Solving for variable 'f'.

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

Divide each side by '-1'.
f = 13

Simplifying
f = 13

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