f(-a)=7-8x

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Solution for f(-a)=7-8x equation: 


Simplifying
f(-1a) = 7 + -8x

Remove parenthesis around (-1a)
f * -1a = 7 + -8x

Reorder the terms for easier multiplication:
-1f * a = 7 + -8x

Multiply f * a
-1af = 7 + -8x

Solving
-1af = 7 + -8x

Solving for variable 'a'.

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

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

Simplifying
a = -7f-1 + 8f-1x

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