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3p-2q=-18 kalikan 2
6p+15q=21
6p-4q=-36 keduanya dikurangi
19q=57
q=57 : 19
q=.... hitung sendiri yaa
nilai q subt 20+5q=7 (ketemu nilai p)
setelah nilai q dan p ketemu
maka subst ke nilai 4p+3q = ...
selesai