Помогите, пожалуйста! 8-ой класс, формула разности квадратов, туплю(
Реши уравнение.
1) (4х+5)(2х-1)-(3х+2)(2х-3)+(х+6)(7-2х)=1
2) (5u+2)(5u+2)+(8u+3)(7-2u)-(u+4)(9u-1)+6=0
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