А)5d=-85,6-3d б)5b - 5b+1=1b+1    ---   ---       ---      ---    6     9        2         3 

а) 5d=-85,6-3d 8d+85.6=0 d=-85.6/8 d=-10.7 б) (5b)/6-(5b+1)/9=(1b)/2+1//3 (5//6)b-(5*b/9+1/9)-b/2-(1//3)=0 (5//6)b-((5//9)b+(1//9))-b/2-(1//3)=0 (5//18)b-(1//9)-b/2-(1//3)=0 -(2//9)b-(1//9)-(1//3)=0 -(2//9)b-(4//9)=0 b=(4//9)/(-(2//9)) b=-2 // - черта дроби