ТОЛЬКО ОТВЕТЫ! СРОЧНО!
1) (2d+7)/7 =1/7 (2d+7)/7 -1/7 =0 2d +7 -1 =0 2d +6=0 2d = -6 d = -3 2) 5m/9 -10/9 =0 5m -10 =0 5m =10 m =2