divide by .9
subtract 1.7x/9 from each side
divide both sides by .81 and you have it.
check my thinking.
0.9X + 9 <= 1.7X - 8.
0.9X - 1.7X <= -8 -9,
-0.8X <= -17,
Divide both sides by -0.8 and reverse
X >= 21.25.
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