F(-1)=x^2-4x^2+X

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Solution for F(-1)=x^2-4x^2+X equation: 


Simplifying
F(-1) = x2 + -4x2 + X

Reorder the terms for easier multiplication:
-1F = x2 + -4x2 + X

Reorder the terms:
-1F = X + x2 + -4x2

Combine like terms: x2 + -4x2 = -3x2
-1F = X + -3x2

Solving
-1F = X + -3x2

Solving for variable 'F'.

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

Divide each side by '-1'.
F = -1X + 3x2

Simplifying
F = -1X + 3x2

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