1. The problem is to solve the equation $42 \div o = 7$ for $o$. 2. The formula to solve for $o$ when dividing is $o = \frac{42}{7}$. 3. Calculate the division: $$o = \frac{42}{7}$$ 4. Simplify the fraction: $$o = 6$$ 5. Therefore, the value of $o$ is 6. This means if you divide 42 by 6, you get 7, which satisfies the original equation.