If I am reading this equation correctly, then this is how you would approach it:
Multiply both sides by 2, in order to get 2y(t-d)/x=d
Multiply both sides by x, in order to get 2y(t-d)=dx
Distribute, in order to get 2yt-2yd=dx
Move the term with d to right, to get 2yt=dx+2yd
Factor out the d, to get 2yt=d(x+2y)
Divide by x+2y, to isolate d and get d=2yt/(x+2y)
If you struggle with the multipying by the denominator portion, I would recommend doing them one at a time. So rather than multiplying through by 2x, multiply by 2 first, and then x in the next step.
I hope this helps!!!
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