7 (4f + 3) - 8f + 6 = 8f + (7 * 5) + 6f

so, we have $7(4f + 3) - 8f + 6 = 8f + (7 * 5) + 6f$

distributing and simplifying parentheses gives us $28f + 21 - 8f + 6 = 8f + 35 + 6f$. combining like terms, we have $20f + 27 = 14f + 35$.

this can then be rearranged into $6f = 8$, so the solution for f is $f = \frac{4}{3}$. and that's pretty good