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=-p-12q-r
2(p)+2(-3q)+2(r) + 3(-p)+3(-2q)+3(-r)
2p - 6q + 2r - 3p - 6q - 3r
dikumpulkan yang variabelnya sama agar mudah menghitungnya
2p - 3p - 6q - 6q + 2r - 3r
-p -12q - r