(-13)×(2/3)-0.34×(2/7)+(1/3)×(-13)-(5/7)×0.34
=(-13)x(2/3)+(1/3)x(-13)-0.34x(2/7)-(5/7)x0.34
=(-13)x(2/3+1/3)-0.34x(2/7+5/7)
= -13-0.34
= -13.34