Answer:
5
Step-by-step explanation:
24-8X=-16
24+16=8X
40=8X
X=5
(4n+1)=(2n-9)
the sum of four times a number and one is equal to the difference of twice the number and 9
now onto the second one,
now, the extraneous part, I don't see either as extraneous, 3 and 12 do work, however, I take it is referring to the root, so if we nevermind the root has ± versions, and say only assuming the value coming from the root is say positive, then