f(-1)=5x^4-7x+8

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Solution for f(-1)=5x^4-7x+8 equation: 


Simplifying
f(-1) = 5x4 + -7x + 8

Reorder the terms for easier multiplication:
-1f = 5x4 + -7x + 8

Reorder the terms:
-1f = 8 + -7x + 5x4

Solving
-1f = 8 + -7x + 5x4

Solving for variable 'f'.

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

Divide each side by '-1'.
f = -8 + 7x + -5x4

Simplifying
f = -8 + 7x + -5x4

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