Question

-7 - 3a ≤ -10

Explanation:

Step1: Add 7 to both sides

$-7 - 3a + 7 \leq -10 + 7$
$-3a \leq -3$

Step2: Divide by -3, reverse inequality

$\frac{-3a}{-3} \geq \frac{-3}{-3}$

Answer:

$a \geq 1$