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there are a few possible first steps.. what do you think?

square it.

yea,
then it's: 18x-9 = x^2 +8x +16
now what?

add 9

ok,
then it's: 18x = x^2 +8x +25
now what?

subtract 8x?

how is it 0?

opps. lol

lets subtrack 18x...
then it's x^2 -10x + 25

=0

Okay, now factor it ?

totally

(x-5)(x-5)

so my answers 5?

so x = 5

idneeeeed.

thank you!

sure!