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1/2x < 15-5
1/2x < 10
x < 5
b. 2-(4+x) ≥ -22
-(4+x) ≥ -22-2
-4-x ≥ -24
-x ≥ -24+4
-x ≥ -20
x ≤ 20
c. 2/3p+4 ≤ 8
2/3p ≤ 8-4
2/3p ≤ 4
p ≤ 4x(3/2)
p ≤ 6
d. 2x-4 > 3x+9
2x-3x > 9+4
-x > 13
x < -13
e. 2y/2 - 7/2 ≤ 3
2y/2 ≤ 3+(7/2)
2y/2 ≤ 13/2
y ≤ 13/2
maaf soal yang bagian d tidak begitu jelas...