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b

c

$\dfrac{n}{\text{-}3}\geq1$

MultNegIneqMultiply by $\text{-} 3$ and flip inequality sign

$n\leq\text{-}3$

d

$\dfrac{1}{4}m \leq \text{-}17$

MoveRightFacToNumOne$\dfrac{1}{b}\cdot a = \dfrac{a}{b}$

$\dfrac{m}{4} \leq \text{-}17$

MultIneq$\text{LHS}\cdot 4 \leq \text{RHS} \cdot 4$

$m\leq \text{-} 68$