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4p + p - 8q + 2q + 5r - 7r
5p - 6q - 2r
kita tambahkan yg sejenis
4p+p = 5p
-8q+2q = -6q
5r+(-7r) = -2r
jadi jumlahnya
5p+(-6q)+(-2r)
atau
5p-6q-2r
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