Answer:
a = -2(2x+1)-4
Step-by-step explanation:
1. Factor out the common term x.
x(4+a)= -2x(2x+1)
2. Cancel x on both sides.
4+a= -2(2x+1)
3. Subtract 4 from both sides.
a= -2(2x+1)-4
The Second one
In the picture above.
I hope that it's a clear solution.