0.9x+9 ≤ 1.7x-8
Isolate variable x on the left, and constants on the right:
0.9x - 1.7x ≤ -8 -9
-0.8x ≤ -17
divide each side by -0.8 (and change the direction of the inequality)
x ≥ 17/0.8
x ≥ 21.25
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