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First add 4 to both sides

-4 + 4 + f/5 = 2+4

f/5 = 6       Now multiply both sides by 5

5 x f/5 = 6 x 5

f = 30

\(-4 + \dfrac{f}{5} = 2\\ \dfrac{f}{5} = 6\\ f = 6\times 5 = 30\)

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