f(0)=90-1

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Solution for f(0)=90-1 equation: 


Simplifying
f(0) = 90 + -1

Reorder the terms for easier multiplication:
0f = 90 + -1

Anything times zero is zero.
0f = 90 + -1

Combine like terms: 90 + -1 = 89
0 = 89

Solving
0 = 89

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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