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a-b=15
a = 15+b
b = 1000/a
klo ditanya bentuk penjumlahan dr lajabar yg diketahui maka
a+b = (15+b)+(1000/a)
utk yg soal terakhir tinggal substitusi aja a ke b ato b ke a, bebas. sy pake contoh substitusi b ke a
a=15+1000/a