Respuesta :

penredmy

Answer:

7x+12

Step-by-step explanation:

since its neg, it take out { and } it no use.

if its like that, you add it.

so the equation: 3x+4x

that is 7x

+12 is after

so you do 7x+12

you can't simp it. So that is the answer

100% SURE
answer: x=-7/12

3x+4x=7x
7x+12
7x=-12
x=-7/12