309 is the same as 93 subtracted from the quantity f times 123

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309 is the same as 93 subtracted from the quantity f times 123.

The quantity f times 123:
123f

Subtract 93:
123f - 93

The phrase is the same as means an equation, so we set 123f - 93 equal to 309
123f - 93 = 309 <-- This is our algebraic expression

If you wish to solve for f, type this equation into the search engine, and we get f = 3.2683.