1.
решите уравнение
3(-1-a)-20=9
6(4-x)+3=3
3x-10=2+6(5+4x)
4(7+x)-3x=7
2.
(x-5)(x+5)=(x-3)^2+2
(x+6)^2=(x-4)(x+4)-8
Подробное решение
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