Question

7 - 7 = s - 4

Explanation:

Step1: Isolate $s$ by adding 4 to both sides

$-7 + 4 = s - 4 + 4$

Step2: Simplify both sides

$-3 = s$

Step3: Verify the solution

Substitute $s=-3$ into original equation: $-7 = -3 - 4$
$-7 = -7$ (True)

Answer:

$s = -3$