6b+b+b is the same as 6b+1b+1b
you can add the numbers together if the variables are the same.
6b+1b+1b=8b
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27
30 + ab + 6b + 5a = 5(a+6) + b(a+6) = (b+5)(a+6)
1.5
6(2a plus b)
5b - 3 - 2b = 6b - 3 3b - 3 = 6b - 3 3b - 6b = 3 - 3 b = 0