Ответы на вопрос:
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)//9)b+(1///2-(1//3)=0
(5//18)b-(1//9)-b/2-(1//3)=0
-(2//9)b-(1////3)=0
-(2//9)b-(4//9)=0b=(4//9)///9))b=-2// - черта дроби
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