You can
put this solution on YOUR website!So This is probably

Maybe it'd help if you rewrote it as

<---- and then cross-multiply. You'll then get

<--- just by looking at this equation, x = 3.
It seems almost stupid, but if you plug in 3 into the equation, you'll get a zero in the numerator. It won't matter what the denominator is because

just as long as that denominator n doesn't turn out to be 0.