6B, 7B, 8B, 9B, 10B, 11B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B
The two most common isotopes of boron are boron-10 (about 20% abundance) and boron-11 (about 80% abundance). Boron-10 has 5 protons and 5 neutrons, while boron-11 has 5 protons and 6 neutrons.
It is: 7b+10 simplified
(-a-7b+5)4ab
11a+7b-(3b-2a)
9a + 7b *remember to look and understand the letters!*
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8b
6a+7b
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
It is: 7b+4b-1b = 10b when simplified
7a plus 2b plus 3a plus 5b is equal to 10a plus 7b.