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Find the unknown numbers in the description. Three times a number is between -18 and 18. The solution set is
so 3 times a number is between -18 and 18 between means it cannot be -18 or 18 so 3 times x=3x x=unknown 3x < less than >greater than
if it is between -18 and 18 then the number is >-18 and <18 so -18<3x and 18>3x divide both equations by 3 -6<x 6>x combine -6<x<6 solution set=(x|-6<x<6)
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