Помогите пожалуйста решить... «Приведение подобных слагаемых»
1) 4h – 8f + 2f – 12h;
2) 3h – (– 2 + h) - 12;
3) - (– 45k + 1) – 2(30k + 5);
4) x + 2 - (7x – 1 – (x + 2)).

1) 3d + 5a – 4d + a;
2) 3(x – 5) – 7(x + 1);
3) 2(x – y) + 2(2x – 3y);
4) -3x + (5 – (2x – 2)).

1) 5a – 4b + 6a + 3b;
2) 7(5 – y) + 3(y - 7);
3) 4(3a – c) - (5a – 2c);
4) 4 + x - (2x + (x – 3)).
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