Приведите подобные слагаемые:2) 13 - 5a + 7 - 2b + 5a + 4b = ?

3) 8a - 17 + 20 - 7a = ?

4) 14x - 14 + 16x + 16 = ?

5) 3x - 15y + 25 - 2x + 25y - 15 = ?
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