1. Упростите выражение:
а) (х-7)(3х-2) – (5х+1)(2х-4);
б) (3а2+5y)(2а3+у) – 7а2(а2-3у).
2. Решите уравнение:
1) (х+3)(х-2)-(х+4)(х-1)=3х;
2) (2х+6)(7-4х)=(2-х)(8х+1)+15.
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