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a+4b= 47
eleminasi
-3b=-20
b= 20:3
a+20:3=27
a=27-20:3
a=81:3-20:3
a=61:3
u16= a+15b
61:3 + 15 x 20 : 3
61:3+100
120,3
U2=a+b=27 dieliminasi dengan
U5=a+4b=47 hasilnya
-3b=20
b=6 2/3
a+b=27
a+6 2/3=27
a=27-20/3
a= 81/3-20/3
a=61/3
U16=………
gak salah soal kamu? haaa??