Solve 12 + 12a + 4a = -4

a=-1

Step-by-step explanation:

we need to get a by itself

first combine like terms

12+16a=-4

now we need to get rid of the 12 so subtract it to other side

-16=16a

now divide 16 by -16 which gives you -1=a

y=x+9

?

step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0