-7
Step-by-step explanation:
First, set the equation equal to one and the x's to 2
Then, solve the parts without variables
4(2)+a(2)+6(2)-5=1
8+a(2)+6(2)-5=1
8+a(2)+12-5=1
Then add like terms
8+a(2)+7=1
15+a(2)=1
Then subtract 15 from both sides
a(2)=-14
Finally, divide by two on both sides
a=-7
