f(0.8)=-15

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Solution for f(0.8)=-15 equation: 


Simplifying
f(0.8) = -15

Reorder the terms for easier multiplication:
0.8f = -15

Solving
0.8f = -15

Solving for variable 'f'.

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

Divide each side by '0.8'.
f = -18.75

Simplifying
f = -18.75

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