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k= x/100

_______
(6-x)/100

how to work? what to do next??

2 answers

I assume you are solving for x.

On the right, multiply numerator and denomiantor by 100..

k=x/(6-x)

now multiply both sides by 6-x

k(6-x)=x
divide each side by k
6-x=x/k
add x to each side
6= x/k + x = x(1/k + 1)
or x= 6/(1+1/k)
forget k

x/100
_______

(6-x)/100
solve for x
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