Step 1 :Subtract $9x$ from both sides of the inequality $10x + 7 \leq 9x + 8$ to get $x + 7 \leq 8$
Step 2 :Subtract $7$ from both sides of the inequality to get $x \leq 1$
Step 3 :The solution to the inequality is \(\boxed{x \leq 1}\), which means that any value of $x$ that is less than or equal to 1 is a solution to the inequality