Respuesta :

LittleRedMe
Work backwards. So instead of adding twelve, you take it away.

-3 - 12 = -15 / 5 = -3
Azieq
number unknown = x

solution =

12 + ( 5x ) = - 3
12 + 5x = - 3
5x = - 15
x = - 3

i am a mathematics teacher. if anything to ask please pm me