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x+5=3x-7 =x+9
-2x+12=x+9
-3x=-3
x=1
kiri
x+5 ≤ 3x-7
5+7 ≤ 3x-x
12 ≤ 2x
6 ≤ x
kanan
3x-7 ≤ x+9
3x-x ≤ 9+7
2x ≤ 16
x ≤ 8
Jadi, HP dari pertidaksamaan linear diatas adalah { 6 ≤ x ≤ 8}