Hey!
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Steps To Solve:
-10 − 8s − 1 = -7 − 4s
~Simplify
-11 - 8s = -7 - 4s
~Add 4s to both sides
-11 - 8s + 4s = -7 - 4s + 4s
~Simplify
-11 - 4s = -7
~Add 11 to both sides
-11 + 11 - 4s = -7 + 11
~Simplify
-4s = 4
~Divide -4 to both sides
-4s/-4 = 4/-4
~Simplify
s = -1
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Hence, the answer is

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Hope This Helped! Good Luck!