-13x2/3-0.34x2/7-1/3x(-13)-5/70x3.4=-13x2/3-1/3x（-13）-0.34x2/7-5/70x3.4=-13x(2/3-1/3)-0.34x(2/7+5/7)=-13x1/3-0.34x1=-13/3-0.34=-701/150
