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pensil=p
15bt+10p=75000 |×2 | 30bt+20p =150000
6bt+6p=31500 | ×5 | 30bt+30p=157500
—–––––––––––
-10p=-7500
p=750
6bt+6p=31500
6bt+6(750)=31500
6bt+4500=31500
6bt=27000
bt=4500
3bt+4p
3(4500)+4(750)
13500+3000
16500