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x - 3 < -13 - 2
x - 3 < -15
x < 5
x : { 6,7,8,9,dst}
4. 2n - 4 = 8 - 4n
2n + 4n = 8 + 4
6n = 12
n = 2
3n - 1 = 3(2) - 1
= 7