Brihat Parashara Hora Shastra
फलं तस्य शुभे युञ्ज्यादशुभे वर्जयेत् तथा । पापश्चेदन्यथा चैवं बले दृष्ट्यां तथैव च ॥ १६॥
If there is a benefic in the Bhava add the same to the auspicious effects and deduct from inauspicious effects, which will denote the inauspicious effects.
english translation
phalaM tasya zubhe yuJjyAdazubhe varjayet tathA । pApazcedanyathA caivaM bale dRSTyAM tathaiva ca ॥ 16॥
hk transliteration by Sanscript