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3x+5 >= 2(2x-1)
3x+5 >= 4x-2
-x >= -7
x <= 7
b. dikuadratkan kedua ruas
4x^2-20x+25 < x^2+8x+16
dipindahkan semua ke ruas kiri
3x^2-28×+9 < 0
1/3 (3x-27)(3x-1) < 0
(x-9)(3x-1) < 0
buat garis bilangan dan hasilnya
1/3 < x < 9