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1p+3b =1350
eliminasi p dengan disamakan
5p+8b =3950
5p+15b=6750
__________-
-7b=-2800
b=-2800/-7. = 400
lalu kita subtstitusi ke salah satu pernyataan
1p+3•400=1350
1p+1200= 1350
1p= 1350-1200 = 150
10•400+5•150
4000+750= 4750