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a+b=11000
a+3000= 11000
a= 11000-3000
a= 8000
4a + 2b = 4(8000)+2(3000) = 32000+6000 = Rp. 38000
jadi, jumlah uang yang harus cantik bayar adalah 38000
a+b=11000
maka berapa 4a+2b?
a=11000-b
3(11000-b)+5b= 39000
33000-3b+5b=39000
2b=39000-33000
2b=6000
b=3000
maka
a=11000-3000
a=8000
jadi
4a+2b= 4 (8000)+2(3000)
= 32000+6000
=38000