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3p-6p<21-3
-3p<18
p>-6
2. 3n+15
3n+15-18
3n-3
3(n-1)
pembuat nol: n=1
garis bilangan :
- 1 +
angka 1 d hitamkan dan diarsir mulai dari angka 1 ke kanan atau ke arah +