You don't have a number alone. Also I'll make the assumption that it is
19a+2a-4a+3a
Without a number alone, it can't really be solved, unless a=0
19a+2a-4a+3a can be simplified however to 20a
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p=b+3a+c p-3a-c=b+3a-3a+c-c p-3a-c=b b=p-3a-c
-21 = 9a - 15 - 3a -6 = 6a -1 = a
3.5
depends what 'a' =
36 -20 = 16