How do you simplify (+3)+(−12)? Prealgebra Negative Numbers and Absolute Value Negative Numbers 1 Answer Jaime Mar 8, 2018 −9 Explanation: 3+−12=−9 You can use a number line if you need to Answer link Related questions How do you compute −8+13? How do you compute 11+(−19)? How do you compute −19−8? How do you compute −77+(−46)? How do you compute 41+(−56)? How do you compute 50−82? How do you compute −47−13? How do you compute −80+102? How do you compute 5(18)? How do you compute −64÷(−8)? See all questions in Negative Numbers Impact of this question 6672 views around the world You can reuse this answer Creative Commons License