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trus pake eliminasi
k + 6b = 320
3k + 4b = 400
yg atas kita kali 3
yg bwh kita kali 1
jadi :
3k + 18b = 960
3k + 4b = 400 ---
----------------------
14b = 560
b = 40
trus buat nyari k nya kita masukkin ke salah satu persamaannya
3k + 4b = 400
3k + 160 = 400
3k = 240
k = 80
berarti klo 7 ekor kuda = 7k
= 7.80
= 560
jadi 7 ekor kuda menghabiskan 560 kg makanan