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2x+1 >= 16
2x>=16-1
2x>=15
x>= 15/2
x>=7,5
2. keduanya dikuadratkan
x + 3 <= x2 + 6x + 9
x2+5x + 6 >= 0
(x+2)(x+3) >= 0
x+2>=0
x>= -2
x+3>= 0
x>= -3