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maya18222

Help with Algebra

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Im fully my Algebra is pretty awful, but i was wondering if someone could go through these for me. I just dont understand how hes going form one to the other, ive tried going from different angles, but just get stuck. I think im missing some part of Algebra here :p anyway, here it u + (-un)/f = 1 uf-un = f u = f/(f-n) no doubt this is easy for you guys, ... but its not for me

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From 1 -> 2 multiply by f;

f( u + (-un)/f ) = 1f

becomes

fu + (-un) = f


from 2 -> 3 there is a step ellipsed

uf - un = f

u( f - n ) = f


u = f / (f - n)

comprende?

-me

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Thankyou,

I understood it as soon as you explained it, so i guess thats a good thing. just not great at actually figuring it out.

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