Question

1400/d-29=41                      

Answer 1

1400/d-29=41

1400/d=41+29

1400/d=70

d=1400/70

d=20

Ответ: 20                                                             

Answer 2

1400/d-29=41

 

1)$frac{1400}{d}-29-41=0$

 

2)$frac{1400}{d}-70=0$

 

3)$frac{1400-70d}{d}=0| *dneq0$

 

4)1400-70d=0 => d=20