1. Упростите выражение:
а) -2x + 3x – 5x
б) 2a – 5 – a + 4

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