f(-2)=12+1

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Solution for f(-2)=12+1 equation: 


Simplifying
f(-2) = 12 + 1

Reorder the terms for easier multiplication:
-2f = 12 + 1

Combine like terms: 12 + 1 = 13
-2f = 13

Solving
-2f = 13

Solving for variable 'f'.

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

Divide each side by '-2'.
f = -6.5

Simplifying
f = -6.5

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