Умоляяяю!!Помогииииите!!!!
Решите на множестве R уравнения:
а)х(х+2)-(х-3)(х+3)=13
б)4х(х-1)-(2х+5)(2х-5)=1
в)(х-3)(х+4)-2(3х-2)=(х-4)²
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