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(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)
=[1+(1/3+1/5+1/7)]*(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)
=1*(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)
=(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*[(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)]
=(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*(-1/3)
=(1/3+1/5+1/7)+1/9+(1/3+1/5+1/7)*(-1/3)
=1/9+2/3*(1/3+1/5+1/7)
=1/9+2/9+2/15+2/21
=1/3+2/15+2/21
=7/15+2/21
=49/105+10/105
=59/105
=[1+(1/3+1/5+1/7)]*(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)
=1*(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)
=(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*[(1/3+1/5+1/7+1/9)-(1-1/3+1/5+1/7+1/9)]
=(1/3+1/5+1/7+1/9)+(1/3+1/5+1/7)*(-1/3)
=(1/3+1/5+1/7)+1/9+(1/3+1/5+1/7)*(-1/3)
=1/9+2/3*(1/3+1/5+1/7)
=1/9+2/9+2/15+2/21
=1/3+2/15+2/21
=7/15+2/21
=49/105+10/105
=59/105
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