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=1*[v2+v3-v5]/[(v2+v3)^2- (v5)^2]=
=(v2+v3-v5)/(2+2v6+3 - 5)=
=(v2+v3-v5)/2v6 * v6/v6 =
=v6(v2+v3-v5)/ (2*6)=
=(v12+v18-v30)/12=
=(2v3+3v2 -v30)/12