f(-2)=-2(-2)-5

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Solution for f(-2)=-2(-2)-5 equation: 


Simplifying
f(-2) = -2(-2) + -5

Reorder the terms for easier multiplication:
-2f = -2(-2) + -5

Multiply -2 * -2
-2f = 4 + -5

Combine like terms: 4 + -5 = -1
-2f = -1

Solving
-2f = -1

Solving for variable 'f'.

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

Divide each side by '-2'.
f = 0.5

Simplifying
f = 0.5

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