Strictly speaking, it is not, but the range -3 to +3 accounts for 99.73% of the total probability.
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If the domain is the set of real numbers, so is the range.
(2x+3) / 5 Domain = All Real Numbers Range = All Real Numbers
1.5655 is your starting value, you need to both subtract and add 3 to that value to determine your range. 1.5655-3= -1.4345 1.5655+3= 4.5655 so your range is -1.4345 to 4.5655
3 plus 3 plus 3 is 9. 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 18.