f(r)=12.75+1.25r

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Solution for f(r)=12.75+1.25r equation: 


Simplifying
f(r) = 12.75 + 1.25r

Multiply f * r
fr = 12.75 + 1.25r

Solving
fr = 12.75 + 1.25r

Solving for variable 'f'.

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

Divide each side by 'r'.
f = 12.75r-1 + 1.25

Simplifying
f = 12.75r-1 + 1.25

Reorder the terms:
f = 1.25 + 12.75r-1

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