1. The problem asks to solve part 3c, but no specific details are given. Assuming it refers to a typical algebraic problem, let's consider a generic example: solve for $x$ in $3x + 6 = 0$. 2. The formula to isolate $x$ is to subtract 6 from both sides and then divide by 3: $$3x + 6 = 0$$ 3. Subtract 6 from both sides: $$3x + 6 - 6 = 0 - 6$$ $$3x = -6$$ 4. Divide both sides by 3: $$\frac{\cancel{3}x}{\cancel{3}} = \frac{-6}{3}$$ $$x = -2$$ 5. Therefore, the solution to the equation is $x = -2$.