1. Упростите выражение:
а) -3a + 7a – 10a
б) 3x – 5 – 2x + 7

2. Раскройте скобки:
a) b + (-7m + 2n)
б) -3p – (-5x +2y)
в) – (a – 4b) + (-8x + 3y)
г) (a – 9) – (13 – a) + (11 – a)

3. Вычислите:

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