How to calculate R^2 from Adj R^2 What is the formula?

Can anyone advise?
I have Adjusted R^2 0.7975, n=10 and K=3 and need to calculate R^2 from this.

I'm using the formula AdjR^2 = 1- (1-R^2) X n-1/n-k-1 Struggling to rearrange this.

Got to AdjR^2/ n-1/n-k-1 -1-1 = R2

please someone help! thanks
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