log4^(x+7)-log4^(x-3)

I may have figured out this one...

(x+7)-(x-3)

x=-(-7-3)

x=10

Is this right???

and

logc^x+logc^y

also this one, but it's different from the first two i think...any help getting started would be terrific!

log2^(x+1)+log2^(x-5)=4

I may have figured out the last problem...

log2^(x+1)+log2^(x-5)=4

log2x+log2(1)=log2+x+log2-5=4

x+1+x-5=4

x-4=4

x=0

??? Is this right ???