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15+4x ≤ 3x+20
4x-3x ≤ 20-15
x ≤ 5
himpunan merupakan anggota bilangan cacah (dimulai dari nol)
{0,1,2,3,4,5}
semoga membantu
= 4x-3x < 20 - 15
= x < 5
jadi, jawabannya adalah c