[1-(2/3+1/5)*1/13]\7/10

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[1-(2/3+1/5)*1/13]\7/10[1-(2/3+1/5)*1/13]\7/10[1-(2/3+1/5)*1/13]\7/10[1-(2/3+1/5)*1/13]\7/10=[1-13/1

[1-(2/3+1/5)*1/13]\7/10
[1-(2/3+1/5)*1/13]\7/10

[1-(2/3+1/5)*1/13]\7/10
[1-(2/3+1/5)*1/13]\7/10
=[1-13/15*1/13]\7/10
=[1-1/15]*10/7
=14/15*10/7
=4/3