Упростите выражения (12.14-12.16)
2.14. 1) (a - a + 6) - (4а + 8а - 11);
2) (11х + 21х - 43) + (60 - 19х1 - 7x');
3) (3ob - 15b + 16) - (17 + 17b + 44b");
4) (-73 + 17х + 19х3) + (-18х3 - 39x + 50). Пожалуйста помогите мне дам много балов​
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