Упростите вырожение:
1) 2(5x-4y+1) - 3(3x-3y+1)=
2) a+b+c-(a-b-c)=
Найдите алгеброическую  сумму многочленов:
1) (-2a^3+ab^2)+(a^2b-1)+(a^2b-ab^2)+3a^3
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