(5d+11)(5d-11)=0
5d+11=0
5d= -11
d= -11/5
d= -2 1/5
5d-11=0
5d=11
d=11/5
d=2 1/5
Ответ: при d= -2 1/5, при d=2 1/5
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(5d+11)(5d-11)=0
5d+11=0
5d= -11
d= -11/5
d= -2 1/5
5d-11=0
5d=11
d=11/5
d=2 1/5
Ответ: при d= -2 1/5, при d=2 1/5